Answer:
210/30
Explanation:
210/30 is the only answer choice that has the value of 7.
The others are different. The first option's value is 7. The 2nd option's value is 70. The 3rd option's value is 70. The last option's value is 700. They all contain 7 but they have zeros after them so that changes the number. This shows that the first option is the answer because it's value is 7.