The correct answer is: A. them
The sentence “There is no possibility of them coming late” is grammatically correct. The pronoun “them” is in the objective case, which is used as the object of a verb or preposition. In this sentence, the pronoun “them” is the object of the preposition “of.”
The other options are incorrect because they are not in the objective case. The pronoun “they” is in the subjective case, which is used as the subject of a sentence. The pronoun “theirs” is in the possessive case, which is used to show ownership. The pronoun “their” is in the objective case, but it is not used correctly in this sentence.
Here are some examples of how the other options could be used correctly:
- They are coming late.
- The book is theirs.
- I gave them the book.