Edgar Guest is an American poet, famous for his optimistic tone. He was also called People's Poet.
A hero is defined as someone who is valuable or appreciated by his achievements or good qualities or by his courage.
In the third option, the speaker contrasts two different groups: first one is described in line 3 of the excerpt ("Are you one...?") and the characteristics of the other group are defined in the other lines (The things that...) and the final line adds emphasis by asking a direct question. The semantic field is also related in the statement and in the excerpt (uncharted, new discoveries, path and undone things, lead, way), making the third option the right answer.
I don't have any background information but if Mrs. Mallard married someone i think that she loves him.
Explanation:
When you marry someone you are making a lifelong commitment. If you didnt love someone i'm not sure that you would make a commitment that you have to honor and stay with him for the REST of your life.
Unless of course Brently is ugly and lives in a mansion then Mrs. Mallard would be a gold digger.
Its a realistic statement and definitely believable. The rest of them has something to do with him having powers. Not everyone is gonna believe that. More people would believe he won an essay contest and takes an educational trip to Washington DC.