The correct option is A Martynia
Seeds which are dispersed by zoochory, i.e., by animals possess certain structural peculiarities like hooks, spines, etc., on their surface. Such, seeds stick to animal's fur, hairs and dispersed by them unknowingly.
Moringa seeds are dispersed by anemochory (wind dispersal) as they possess wings on their surface.
Medicago seeds possess spikes on their surface which are dispersed by animals and birds. It clings to animal or bird body.
Xanthium seeds are dispersed by zoochory but their seeds have hooks or spines on their surface.
Martynia seeds possess cat's claw or tiger's claw like structure on its one end. It clings to animal body and dispersed easily.
Thus, the correct answer is option A.