Children are to meet with setbacks as they grow up, so their parents don’t have to worry a

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A. consistent
B. arbitrary
C. fragile
(答案→)D. bound
解析：考查固定词组。Be bound to do sth一定会做某事；A一致的；B随意的；C易碎的；根据句意说明D正确。句意：在成长的过程中，孩子一定会遇见一些挫折的，所以他们的父母亲不要太担心这样的事情。