A recent survey showed that while many banks have service charges on interest-bearing and
non-interest-bearing accounts with balances that are falling below a set minimum, some banks provide virtually free checking regardless of the account balance.
A. with balances that are falling below
B. whose balances fall below
C. whose balances fall below that of
D. that have balances below that of
E. that have balances that fall below those of
I chose C,and the correct answer is B
Why is C wrong? I think “that” refers to the balance and “that” is necessary.
I want to know why I was wrong and how can I get this kind of question right when I come across it again.
Thanks!