Depression is the leading cause of suicide, __    __ in turn is the third leading cause of death among 15 to 24 year olds in the United States．
A．whoB．whichC．thatD．what
B
考查定語(yǔ)從句。句中which引導(dǎo)非限定性定語(yǔ)從句，指代前面的一件事，故選B。
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