Why are plants roots important to prevent erosion?

a. plant roots anchor the soil in place.
b. plant roots build a barrier, preventing wind or rain from reaching soil.
c. plant roots absorb the water that would otherwise wash away the soil.
d. plant roots take up space, leaving very little soil present to erode.

quite sure it's not b or d and sources online are either saying it's a or c.

Because the earth is not round ,but it may seem round when viewed from ,our planet but true some points earth is not round was an oblate spheroid -a square that it squashed as globe however is not even a perfect oblate spheroid.in fact isaac newton's first proposed that earth was not perfectly round but it was an oblate spheroid instead.that mean a square that is squashed as its poles and swollen at the