Actually, yes, this is true. Let's look at some examples with the word "all" to see if it agrees with verbs in singular or in plural:
All is lost
All is well
All is arranged already.
All of it is nice
This shows us that "all" agrees with verbs in singular form: the correct answer is a) True.
The answer to the first question is most likely A. It makes the most sense to me. Though, I apologize if I'm incorrect. ^_^
Answer:
if I'm correct the answer is d