The image of a devoted and noble angel in white heals the wounded and rescues the dying is making a eback the nation faces a crisis.
A. that…because
B. who…when
C. which…that
D. what…as
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A. that…because
(答案→)B. who…when
C. which…that
D. what…as
解析：who引导的是定语从句，修饰先行词angel in white白衣天使；而 when引导的是时间状语从句，表示当国家（民族）面临危机时。