Remark
The problem is not giving you the answer. The answer is a number raised to the third power divided by 10.
The problem is trying to tell you what's wrong with the other answers.
Lower Left: The problem is that that is a 1/2 truth. It is a number divided by 10. But that's not as complete an answer as the given answer. You have to note that g is raised to the 3rd power.
Upper Right: The problem (and this is one of those things I don't know how to explain because I don't know why you would choose it) that the number (g) is raised to the third power not the second. So this choice is wrong.
Lower Right: Multiplication would place the ten right beside the g as in 10g^3. The bar under g indicates division