Choosing between models is a decision; the model types are desktop and laptop, and the decision is personal, so the decision is for the consumer. There are multiple ways to do this and there may be better combinations but that should be grammatically correct
Answer:
You must stay in bed and rest
You mustn't run around and play around
Answer:
I believe its B it makes the most sense
The answer is C because I already took the test! Good luck:)