Problem: How does the sentence end?

Rachel's protein pancakes tasted horrible unlike Cynthia's because 
OPTIONS:
- Rachel remembered to add in sugar before cooking.
- Cynthia remembered to add in sugar before cooking.
Answer: Cynthia remembered to add in sugar before cooking.

Problem: How does the sentence end?

The dog could not see that the pole is behind the fence because the 
OPTIONS:
- fence is shorter.
- pole is shorter.
Answer: pole is shorter.

Problem: How does the sentence end?

The field was full of wildlife at dawn, but was empty by dusk, as the 
OPTIONS:
- dawn was a more hostile climate.
- dusk was a more hostile climate.
Answer: dusk was a more hostile climate.

Problem: How does the sentence end?

To mentally prepare for the speech, Adam ate the vitamins and stopped eating the chips because the 
OPTIONS:
- chips were bad for his memory.
- vitamins were bad for his memory.
Answer:
chips were bad for his memory.