Which sentence most clearly describes a theme? a. the two characters have many opportunities to show their feelings for each other, but polite society makes that difficult. b. henry's broken pocket watch represents his broken relationship with jill, in which each always misunderstands the other. c. jill doesn't feel that she deserves henry, but henry feels the same way about her; they never reveal their true feelings. d. the situation of love not being returned is introduced every time the two characters fail to express how they feel about each other.

D. "The situation of love not being returned is introduced everytime  the two characters fail to express how they feel about each other". -APEX

The correct option is ANXIETY.
Anxiety refers to an uncomfortable feeling and nervousness about something that is already happening or something that might happen in the future.
Considering the passage given above, you will notice that Europe is really bothered and worried about her present state. She felt that she is no longer the same and might soon lose consciousness and perish completely. This shows a state of anxiety, where the affected is worried and uncertain about what the outcome of a situation will eventually be.