7516. We should abstain from casting aspersions on the character of our colleagues.

✅ The correct answer is option D.
Cracking : excellent.

Slanderous : (of a spoken statement) false and malicious.

Critical : expressing adverse or disapproving comments or judgements.

Throw : propel (something) with force through the air by a movement of the arm and hand.

Casting : throw (something) forcefully in a specified direction.

Synonym of Casting is Throw