Many financial analysts consider an upward trend in a firm’s current ratio a sign of improving liquidity.
A a sign of
B as a sign of
C to be a sign of
D a sign of their
E as being a sign of
I chose answer B. However, the correct answer is A, and the explanation is that "consider x as y" is ungrammertically correct.
I looked up the dictionary, and found that both A and B are correct. Therefore, Do I have to choose A, in the GMAT Exam?