Answer:
B.

Explanation:
First, we can represent "2 less than" as a subtraction of 2 from some value (indicated by the blank).

Next, we can fill in the blank with "the quotient of a number and 4", which means that a number (x) is being divided by 4.
B.

Further Note
According to the Oxford English Dictionary, a quotient is "a result obtained by dividing one quantity by another".