Answer: denominator
Step-by-step explanation:
The bottom number of a fraction (meaning the number below the line) is called the denominator. It can also be called the divisor in some cases. As we can see here, the 9 is in the denominator position.
We know the answer is not numerator because that is the number above the fraction line, or more simply, the upper number. In this case, that would be 7. Lastly, product and sum do not apply since we are working with a fraction, which is essentially division and not multiplication or addition
Hope this helps!