Answer:
B.
Explanation:
The options for this question are
A. 7 less than a number
B. A number subtracted from 7
C. A number minus 7
D. The difference between a number and 7
The given expression is

As you can observe, the expression two terms which are subtracting. However, it's important to pay attention to the right order of the subtraction. Notice that from a number is being subtracted seven units, so the choice we are looking for has to have the wrong order of the subtraction.
SO, option B has the wrong order of the operation, because states "a number subtracted from 7" which means
which is not the case.
Therefore, the right answer here is B.