Subject :IMO Class : Class 8

A three digit number has (2x+1) as its hundreds digit, (x−1) as its tens digit and x as its units digit. The three digit number, in terms of x, is

A2x^{3} − x^{2} − x

B211x + 90

C211 + 90x

D211x^{ 2} + 90x

option b is not correct. why?