Problem: How does the sentence end?

Mary would be retiring from being a teacher soon but Emily would not because 
OPTIONS:
- Mary was very old.
- Emily was very old.
Answer: Mary was very old.
sentence: Alex wanted to swim in the ocean instead of in the lake because the  OPTIONS:
- ocean is harder to float with its clear water property.
- lake is harder to float with its clear water property.
complete: lake is harder to float with its clear water property.
Kim's employer replaced her office carpet with wood after the smell got so bad, the 
OPTIONS:
- carpet was new.
- wood was new.
wood was new.
Input: Continue writing.

The box can store the food better than the bottle for storing lunch because the opening of the 
OPTIONS:
- box is narrow.
- bottle is narrow.

Continued: bottle is narrow.
Story needs to be completed:
Erin refused to clean the house so Laura had to do it since 
OPTIONS:
- Erin did not care if their guests came over to a dirty house.
- Laura did not care if their guests came over to a dirty house.

My choice:
Erin did not care if their guests came over to a dirty house.
Problem: How does the sentence end?

Christopher was given a quest by Kenneth, so 
OPTIONS:
- Christopher followed the map and solved the clues.
- Kenneth followed the map and solved the clues.
Answer:
Christopher followed the map and solved the clues.