The right answer is C. but lets just check
A. 4 hundreds 9 tens 2 ones = 400 + 90 + 2 = 492 so that's right
B. 4 hundreds 92 ones = 400 + 92 = 492 so that is right also
C. 49 hundreds 2 ones = 4900 + 2 = 4902
D. 49 tens 2 ones = 490 + 2 = 492
That is how we know that that C. is incorrect
I hope this helps :)