There are two caps on the table, belongs to Tom.
A. the smaller of which
B. the small of that
C. the smaller of them
D. the small one
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(答案→)A. the smaller of which
B. the small of that
C. the smaller of them
D. the small one
解析：句意：在桌子上有两顶帽子，其中比较小的那顶是汤姆的。这里是非限制性定语从句，that不能引导非限制性定语从句，故排除B；又因为逗号前后都是句子，所以缺少连词，故排除CD；which在从句中作主语，故选A。