The correct answer would be the last one: That the monument of Colonel Shaw, like the aquarium, will one day likely be destroyed and forgotten.
"For the Union Dead" is a poem that was written by Robert Lowell as part of a bigger collection titled with the same name (and published in 1964), and which was first published in 1960. In this poem, what Lowell does is to reflect on the changes that are taking place in his home in Boston, due to advancements and social and technological development, but which are not necessarily the best, and are threatening a way of life that was accomplished thanks to the efforts of others in history. As such, he uses the image of Colonel Shaw, and his infantry of all-black soldiers, who went to the Civil War to fight against slavery and racial discrimination, and whose memory is preserved through a monument that is now being threatened with destruction by development, just as the old acquarium has already been destroyed. To put forth this idea, Lowell makes use in the beginning and end of the image of bursting bubbles, both regarding the fish he once watched as a child in the aquarium, and the bubble over which Colonel Shaw stood, which represented his desire to end racial discrimination and racism in general. In both instances, the bubbles burst, one because the aquarium has been torn down for improvements, and the other because racial discrimination is still rampant and the cause against it is being abandoned by people.
character versus self: A young woman is struggling with the decision to choose a new career or stay in the same, comfortable but boring job.
character versus society: With the help of an artificial leg, an amputee trains for his first marathon, regardless of skepticism from is friends, family, and community.
character versus nature: A man races against time to rush his son to the nearest hospital to treat him for a snake bite.
character versus character: A husband and wife constantly argue about how to raise a child after they learn about the wife's pregnancy.
In literature, conflict can be defined as the struggle between two opposing forces. Conflicts are what makes a story interesting, what gives characters the chance to develop and evolve. The types of conflict mentioned above, in the answer, are probably the most common ones.
Character versus self: the character struggles with his own feelings, desires, fears, etc.
Character versus society: society demands or expects something from the character, but he wants and does something else.
Character versus nature: is usually a fight to survive. The character needs to face natural forces such as storms, rivers, animals, etc.
Character versus character: two characters struggle and fight each other. Usually, their desires and purposes clash.
Speech: What does the character say and how does he/she speak? Thoughts: What is shown about the character through his/her private thoughts and feelings? Effect: What effect does the character have on other people? How do they feel or react to him/her?