In General, to Calculate the Time Required for a Given

In general, to calculate the time required for a given initial concentration to decrease by 35% given the rate constant with units of 1/M^-1s^-1, which equation should be used

A) ln([A]_t/[A]_o) = - kt
B) t_1/2 = ln2/k
C) [A]_t = -kt + [A]_o
D) 1/[A]_t = kt + 1/[A]_o
E) Rate = k[A]