In the Commonly Used Multiplicative Binomial,it Is Assumed That the Underlying

In the commonly used multiplicative binomial,it is assumed that the underlying factor

A) moves up by a factor u > 1 with probability p.
B) moves down by a factor u > 1 with probability p.
C) moves down by a factor d < 1 with probability 1 - p.
D) either A or B
E) either A or C