Cole crops are highly self-incompatible and protogynous in nature, which results in:

Correct option is C

Cole crops are highly self-incompatible and protogynous, leading to plants being highly heterogeneous and highly heterozygous, which results in a high degree of genetic variation.
(a) High uniformity in plants: Incorrect, self-incompatibility prevents uniformity.
(b) Low genetic variation: Incorrect, high genetic variation exists due to cross-pollination.
(d) Complete sterility: Incorrect, plants are fertile but cross-pollinated.
Important Point: Self-incompatibility is a natural mechanism to avoid inbreeding and ensure genetic diversity in crops like cabbage and cauliflower.