The woman is reading the book over there is a volunteer?---Yes. She is very kind. She

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A. which; look after
B. what; look up
C. whom; hand out
(答案→)D. who; cheer up
解析：look after照顾，照看；look up 向上看，查阅；hand out交出；cheer up使……高兴起来。句意：那个正在那边看书的女人是个志愿者吗？——是的，她非常善良。她喜欢在医院中使那些生病的孩子高兴起来。结合语境可知上文先行词the woman为下文定语从句中的逻辑主语，指人，故引导词用who，故选D。