The correct option is D general
The word 'particular' refers to an individual item.
Option A, common refers to something prevalent or occurring often.
Option B, usual refers to something customary or habitually occurring.
Option C, specific refers to something clearly defined or identified.
Option D, general refers to affecting or concerning all or most people or things.
Thus, according to the meaning, the word 'general' is the opposite of the word 'particular'.