The correct option is C Vegetative reproduction
Walking fern refers to two species of fern in the genus Asplenium of the genus Camptosorus. The name "walking fern" is derived from the fact that its new plantlets grow wherever the arching leaves of the parent plant touch the ground, creating a walking effect. Both have evergreen, undivided, slightly leathery leaves, which are triangular and taper to a thin point. On the bottom of the leaves, sori, or spore-bearing structures, cluster along the veins.