Choose the correct options for the given blanks.
If you had been a little more proactive, this golden opportunity would not have____

Options A and C are not general idiomatic expressions and would not fit. 

Both "slipped through your fingers" and "escaped your hands" are grammatically correct and idiomatic expressions that convey the idea of missing an opportunity. 

However, "slipped through your fingers" is the more commonly used and natural phrase in English to describe letting something valuable get away.

Therefore, Option B is the correct answer.