Answer:
A. Everybody likes the new train because it is so fast!
Step-by-step explanation:
An indefinite pronoun is the pronoun that does not refer to any person or thing in particular and makes use of the words "anything, something, everyone,", etc.
Therefore, the sentence correctly uses a
SINGULAR indefinite pronoun is option A. This is because, the meaning of the sentence is clear and free from ambiguity.