We are asked that which of the given options best fits the given blank.
The _______ of 14 and 7 is 7.
The given options are:
a. product
b. quotient
c. sum
d. difference
Let us try each of the given options!
1st option:
The product of 14 and 7 is 7 ?
That's incorrect since we know that the product of 14 and 7 is equal to 98.

2nd option:
The quotient of 14 and 7 is 7 ?
That's incorrect since we know that the quotient of 14 and 7 is equal to 2.

3rd option:
The sum of 14 and 7 is 7 ?
That's incorrect since we know that the sum of 14 and 7 is equal to 21.

4th option:
The difference of 14 and 7 is 7 ?
That's correct since we know that the difference of 14 and 7 is equal to 7.

Therefore, the correct answer is the last option (d).
The difference of 14 and 7 is 7.