Hmmm what I might do is this (especially if I'm short on time):
Write the following in the scrap paper:
As 1.4^2=1.96 I can be pretty sure that 1.44^2>2 So I'd pick 4 (C). If I have time I will actually do 1.44*1.44 to make sure I'm right.
Keep on asking, and it will be given you;
keep on seeking, and you will find;
keep on knocking, and it will be opened to you.