Answer:
You must stay in bed and rest
You mustn't run around and play around
No, it is a common noun. Only proper nouns are capitalized.
Answer:
The answer to this question is B.
Answer:
A, B, and D are written correctly.
Explanation:
Either you wrote a typo and meant to write 'incorrectly' - in which case the answer is C for the noncapitalized first word, OR you are playing around with us.