关于it/they指代的问题

jbc88

拿个题说吧。这么空对空。受不了啊

jbc88

LZ似乎考完了吧。。我给个题吧。

220. (GWD-24-8)
The results of the company's cost-cutting measures are evident in its profits, which increased five percent during the first three months of this year after it fell over the last two years.  
A.    which increased five percent during the first three months of this year after it fell
B.    which had increased five percent during the first three months of this year after it had fallen
C.    which have increased five percent during the first three months of this year after falling
D.    with a five percent increase during the first three months of this year after falling  
E.    with a five percent increase during the first three months of this year after having fallen


我希望大家在看看，A中的it指代什么呢？