问题详情

While the causes of the Cretaceous-Tertiary extinction have received the most attention, Alvarez"s paper points out work on the other major mass extinctions that may also be______for the tragedy.
A．answerable
B．indefensible
C．pitiable
D．reprehensible
E．avoidable请帮忙给出正确答案和分析，谢谢！