if the choices are:
a.the soil in the o horizon is also light brown.
b. the parent material rock had feldspar minerals in it.
c. the c horizon is very deep.
d. the soil in o, a, and b horizons supplied feldspar to the lower c horizon.
then ans is c.
the answer is false but i have to keep typing to be able to submit it for your answer. sorry about the long response but i need words to submit whoops.