The more root hairs a plant has, the more water and nutrients it can absorb. which is an appropriate justification of this statement?

a) with more root hairs, there is more surface area of the root and therefore more absorption of water and nutrients.
b) with more root hairs, there is less surface area of root and therefore more absorption of water and nutrients.
c) with more root hairs, there is more length to the root and therefore more absorption of water and nutrients.