Everything in this big city is expensive,and the rise in electricity costs ___ our cifficulties.A.adds up B.adds to C.adds up to D.adds

Everything in this big city is expensive,and the rise in electricity costs ___ our cifficulties.
A.adds up B.adds to C.adds up to D.adds

B
主语是rise,add to增加的意思.
add up合计
add up to加起来达到……
电价上涨增加了我们的困难.

答案：
C