Why would a long taproot be beneficial for large woody dicot such as a tree?

Taproots are super long roots that go far into the ground, so not only do these roots help anchor the tree, it also helps the tree when there may be a drought.  The taproots can get down deep into the ground, where there is a higher chance of finding water deeper down in the soil. 

Ihate school can u relate

The answer is option b.