Answer:
Z=integers
Step-by-step explanation:
The options are not given; however, the question can still be answered
Given

Required
Determine the smallest set of number that describes the given value

First, we need to simplify the given value
Divide the numerator and denominator by 6

Comparing -3 to set of numbers such as integers, real numbers, irrational number, etc.
We can limit -3 to two categories of numbers which are: Real numbers and Integers
But the scope of real numbers is wider than integers;
Hence, the smallest set of number is integer