Problem: How does the sentence end?

The software was harder to install on the computer than on the laptop because the 
OPTIONS:
- computer was running slower.
- laptop was running slower.
Answer: computer was running slower.
sentence: The photographer was preparing to take pictures for multiple weddings and replaced the camera but not the lens because the  OPTIONS:
- camera was new.
- lens was new.
complete: lens was new.
Rachel gobbled down the pancakes that Natalie had prepared in the kitchen because 
OPTIONS:
- Rachel was so skilled.
- Natalie was so skilled.
Natalie was so skilled.
Input: Continue writing.

Tanya created a beautiful picture but Lindsey did not as 
OPTIONS:
- Tanya was a terrible artist.
- Lindsey was a terrible artist.

Continued: Lindsey was a terrible artist.
Story needs to be completed:
The skin treatment made her skin look better than the face mask did. The 
OPTIONS:
- skin treatment must work efficiently.
- face mask must work efficiently.

My choice:
skin treatment must work efficiently.
Problem: How does the sentence end?

Neil underwent the medical procedure performed by Nick, and 
OPTIONS:
- Neil got through the procedure with flying colors.
- Nick got through the procedure with flying colors.
Answer:
Neil got through the procedure with flying colors.