We should abstain from casting aspersions on the character of our colleagues.

The correct answer is: C. critical.

To cast aspersions on someone’s character is to make negative and unfounded remarks about them. It is a form of slander, which is a false statement that is harmful to someone’s reputation. Critical remarks, on the other hand, can be either positive or negative, and they are often based on facts or opinions.

Option A, cracking, is not a synonym for aspersions. Cracking is a verb that means to make a joke or to say

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