Answer:
Life is going to be rough sometimes, but that does not mean you should stop trying or give up.
Explanation:
What book is this you didn't say
B: With whom will you be coming to the party? This is written correctly.
Answer: C. Going to the beach in the summer is one of my favorite vacations and so is going to the mountains in the fall.
The sentence presented above is corrected by omitting the "comma" after the conjunction "and" making it a grammatically correct sentence.