To answer questions with power 10, one of the ways we can do it is to write all the numbers without the power 10.
The number in the power is the number of places we need to get the number to the left of the decimal dot. Remeber that if we don't have any more decimal places, we add 0s instead.
So, the number
Need to get 7 places to the left, so we start with the decimal places and, when we don't have decimal places anymore, we add zeros. We can 5 number on the decimal places, so we will put all of these to the left and we will still need two more zeros to complete all the 7 in the power 10:
Notice that before we had only one number to the left of the decimal dot, the "3", but now we have a total of 8, the 1 we had plus the 7 we got from the power 10.
in the options, we have two of them in power ten, so we can do exactly the same with them:
We started with 1 and ended with 7 to the left of the decimal dot.
And the last is:
Now, we can compare them all:
We can see the the two first options are one place less then the number we have, so they are less than it.
The last two are in the same place, but the last have a lower number, so it is less than the one we have.
So, the only one that is greater than the one we have is the one in alternative C.