Answer:
A.
Step-by-step explanation:
When we solve a problem, we always multiply and divide before subtracting and adding, so we'd divide 9 by 3 to get 3. So the problem would become 20- 3 = 17. And 20 - 3 = 17 as well, so A's expression is equal to 20 - 9 ➗ 3
