问题补充：
What I am concerned about is they could fit in with society and how we can create more opportunities for them.
A. which
B. what
C. whether
D. who
答案：
A. which
B. what
(答案→)C. whether
D. who
解析：C考查名词性从句。分析题干可知空格后面部分的句子成分完整，排除要在句中作成分的A、B、D三项； whether在句中不作成分，意为“是否”，符合句意。
