In the question given below, a few words are given in

Solution

A-D (Pernicious – Salutary): Pernicious means having a harmful effect, especially in a gradual or subtle way. Salutary refers to something producing good effects or being beneficial to health. They are direct opposites in terms of impact (Harmful vs. Beneficial). C-F (Reticent – Voluble): Reticent describes a person who is reserved and not revealing their thoughts or feelings readily. Voluble describes someone who speaks incessantly and fluently. They are opposites regarding the quantity and ease of speech.