The simple subject is Mrs. Hill, The subject would be my teacher Mrs.hill
The answer is c. the fleeting nature of existence.
The narrator mentions that the lovers will never kiss, but they will also never age, and the trees will never lose their leaves. Therefore, mortality will never reach them--which is what all humans want, so he is happy that they get to exist forever young.
The sentence that has an incorrect shift in pronoun antecedent agreement is A) No one had noticed the pickpocket stealing their wallet.
We will need a link to what we are reading
1. heredity
2. environment
3. peers
4. culture
5. media