The correct option is
D Both B and C
In a plant with a taproot system, the taproot is the largest, most central and most dominant root. Typically a taproot is straight and very thick. It is tapering and grows directly downward. From taproot, other roots sprout laterally. Napiform type of storage root is distinct from taproot. The root has a top-like in appearance. It is very broad at the top and tapers suddenly like a tail at the bottom. Turnip is an example for modified taproot and modified napiform root.
Thus, the correct answer is option D.