OA can be either A or D
A: healthier than regular agricultural produce is.
D: healthier than regular agricultural produce.
The GMAT occasionally allows unnecessary helping verbs:
Right: Apples are more healthy to eat than caramels.
Right: Apples are more healthy to eat than caramels ARE.
Source: MGMAT SC
Both A and D are grammatically correct.
A: healthier than regular agricultural produce is.
D: healthier than regular agricultural produce.
Quote:
The GMAT occasionally allows unnecessary helping verbs:
Right: Apples are more healthy to eat than caramels.
Right: Apples are more healthy to eat than caramels ARE.
Source: MGMAT SC
Both A and D are grammatically correct.
