Answer:
I really don't know so sorry
The answer would be 63 bc 46+71= 117 then a triangle usaually equals 180 so 180 -117=63!!
So,
Optimally, we want a number between 1 and 10 multiplied by a power of ten.
If we move the decimal place 6 places to the right, we get 6.
So we want

.
The correct option is C.