If Willa and I hear from our parents then we will let you know.
Answer:
It means that for some reason the group of people in the sentence paid special attention to the name for one reason or another.
By explaining problems and giving solutions! this is the best fit because the other two might make sense at a first glance, but only explaining problems and solutions would be an effective way to teach people how to set up an aquarium by giving them examples of what to do and what not to do whereas the others are just him talking about his aquarium.
There are many themes in the novel Scarlet Letter, written by Nathaniel Hawthorne, and certainly the most important of them is the concept of sin and how it should be treated. As you already know, the heroine of this novel is Hester Prynne, who cheated on her husband and was thus condemned by the whole society, which didn't want to forgive her. Another theme is love, primarily between Hester and the priest, but also between Hester and her child. The position of women in society is another theme.
