Why Is Clay Particularly Important in Determining Many Soil Characteristics

Multiple Choice

Why is clay particularly important in determining many soil characteristics?
I. clay particles have the smallest surface area relative to other soil particles
II. each clay particle has negative electrical charge on its outer surface to attract mineral ions
III clay is the most porous of the soil particles
IV. clay is the largest of the soil particles

A) I
B) II
C) III
D) IV
E) I and II