Budding is mode of asexual reproduction wherein an outgrowth of part of a cell/body develops into progeny and eir get separated or remain attached to parent to form a new colony. Options II and III are incorrect as nucleus should be present in all buds. Option I show bud formation and nuclear division. Options IV and V show chain of cells produced by budding. 

Answer:

Bulbils are a small bulb-like structure which may be removed to form a new plant. Agave can sexually reproduce by seeds and vegetatively by aerial bulbils and ground level based shoots and rhizomes. Colocasia reproduces sexually by seeds and vegetatively by corms, tubers and root suckers. Zingiber reproduces vegetatively by aromatic articulated rhizomes. Vallisneria reproduces vegetatively through runners.