Vegetative propagation is a way of propagation in which vegetative organs such as roots, stems and leaves of higher plants develop into new individuals. Vegetative reproduction belongs to asexual reproduction.

(1) Propagation with roots: such as tuber propagation of sweet potato and root propagation of chrysanthemum.

(2) Stem propagation: such as creeping propagation of strawberry, rhizome propagation of bamboo, reed, white thatch and lotus, tuber propagation of potato, bulb propagation of lily and onion, bulb propagation of narcissus and taro, etc.

(3) Propagation with leaves: leaf bud propagation of begonia, leaf propagation of pepper grass, etc.

Therefore, in the process of creeping propagation of strawberry, there is no combination of bisexual germ cells, and new individuals are directly produced by the mother, which belongs to asexual propagation.

Therefore, choose: d.