Among the Atomic Bomb Survivors,the Number of Leukemia Victims Has

Among the atomic bomb survivors,the number of leukemia victims has _______________ since the late 1940s and early 1950s.However,the occurrence rates of other radiation-induced malignancies have continued to ___________since the late 1950s and early 1960s.

A) slowly declined;escalate
B) increased rapidly;decrease
C) increased slowly;decrease
D) rapidly declined;decrease