Some states have an income tax similar to ______ of the federal

Some states have an income tax similar to ______ of the federal government.
A、that
B、those
C、this
D、these
【正确答案】：A
【题目解析】：本题考查that作一般代词的用法。that在这里指代的是income tax，这句话的意思是：有些州有一个和联邦政府一样的所得税。