Answer:
B. paid them
Step-by-step explanation:
The expression "paid them" shown in the sentence above is incorrect. This is because this expression is related to "Individual tennis players" who are the subjects of the sentence. The word "them" can only be used to refer to the object of the sentence and not to the subject. In this case, the correct thing would be to use "paid their", since "their" can be used to refer to the subject of the sentence.