The correct option is C offsets
Offsets are one internode long small runners which are found in rosette plants at ground or water level. The upper portion of the branches bear a group of leaves while the lower portion bears the roots. Each branch is capable of growing into an independent plant after separating from the parent plant. E.g., Eichhornia, Pistia etc. Runner, stolon are subaerial modifications of stem and tuber is underground modified stem.