The correct option is C 16.7
We know that 1.670 = 16701000
So, option (b) is correct.
Also 16701000 is same as 167100
So, option (a) is also correct.
In option (c), 16.710 can be written as 167100 which is same as the correct option (a). So, (c) is also correct.
In (d), 16.7 is NOT equal to 1.670. So, option (d) is not equivalent to 1.670/