Answer:
B. 4 minus the quotient of a number and 3
Explanation:
we have the expression:

The first thing we can see is that we have the number 4 minus something else, the 4 is not added or multiplied, this discards options A and D.
Now, we have x which we don't know the value, so we call x 'a number', and that number is divided by 3. In other words we have the quotient of a number and 3.
This lefts us only with option B: 4 minus the quotient of a number and 3
which describes completely the expression we have.