Problem: How does the sentence end?

Planting daffodils was a fun hobby for Donald to learn from Ian since 
OPTIONS:
- Donald was an amateur gardener.
- Ian was an amateur gardener.
Answer: Donald was an amateur gardener.
sentence: The air in the house was cooler than in the apartment because the  OPTIONS:
- apartment had a broken air conditioner.
- house had a broken air conditioner.
complete: apartment had a broken air conditioner.
Even after only dating for three months, Christine fell in love with Erin because 
OPTIONS:
- Christine was very obsessive.
- Erin was very obsessive.
Christine was very obsessive.
Input: Continue writing.

My job didn't provide me with enough money to buy a truck, because the 
OPTIONS:
- money was expensive.
- truck was expensive.

Continued: truck was expensive.
Story needs to be completed:
Elena brought up the subject of real estate to Katrina because 
OPTIONS:
- Elena was interested in selling a house.
- Katrina was interested in selling a house.

My choice:
Elena was interested in selling a house.
Problem: How does the sentence end?

Katrina celebrates Christmas every single year with their family while Tanya celebrates Hanukkah with theirs. 
OPTIONS:
- Katrina practices Christianity.
- Tanya practices Christianity.
Answer:
Katrina practices Christianity.