[Q]: How does the sentence end?

Erin always had a steady stream of clients unlike Angela who only had a few clients because, as a professional, 
OPTIONS:
- Erin was very knowledgeable of tax laws.
- Angela was very knowledgeable of tax laws.

[A]: Erin was very knowledgeable of tax laws.
QUES: Continue writing.

Matthew worked in a greenhouse while Samuel did not since 

OPTIONS:
- Matthew had all of the right educational qualifications necessary to work there.
- Samuel had all of the right educational qualifications necessary to work there.
+++++++++
ANS: Matthew had all of the right educational qualifications necessary to work there.
Problem: How does the sentence end?

After the trip, Tanya had a wicked case of Diarrhea, though Rebecca had none. 
OPTIONS:
- Tanya has the stronger stomach.
- Rebecca has the stronger stomach.
Answer: Rebecca has the stronger stomach.
sentence: Mary stopped feeding the cow grass and began to only feed it grain, because the  OPTIONS:
- grass kept the cow healthy.
- grain kept the cow healthy.
complete: grain kept the cow healthy.
Benjamin has whiter teeth than Jason because 
OPTIONS:
- Benjamin uses a toothpaste with baking soda in it.
- Jason uses a toothpaste with baking soda in it.
Benjamin uses a toothpaste with baking soda in it.
Problem: Continue the following story.

The seeds were a better deal than the plants, because the 
OPTIONS:
- seeds were full price.
- plants were full price.
Here's how I want to continue it:
plants were full price.