Answer:
<h2>B. {−21, −7, 7, 21}
</h2>
Step-by-step explanation:
Choices for this question are
A. {−21, 21}
B. {−21, −7, 7, 21}
C. {−14, 0, 14}
D. {−21, −14, −7}
We need to pick a set that has elements of Z and they are odd number and multiples of 7.
Therefore, the right answer is
B. {−21, −7, 7, 21}
Because, this set includes all elements of set Z that are odds and multiples of 7.
The choice A doesn't include -7 and 7, which has to.
Choice C and D includes even numbers.