Define the Magnitude of a Number as the Location of the Decimal

Define the magnitude of a number as the location of the decimal point from the left of the number (that is, if a number has 4 digits followed by the decimal point, it will have a magnitude of 4) . 100 would then have a magnitude of 3 and 55,555.555 would have a magnitude of 5. A partial recursive method is given below to compute a positive int parameter's magnitude. Which answer below is needed to complete the method? public int magnitude(double x)
{
If (x < 1) return 0;
Else return _______;
}

A) magnitude(x - 1) + 10;
B) magnitude(x - 10) + 1;
C) magnitude(x / 10) + 10;
D) magnitude(x / 10) + 1;
E) magnitude(x / 10) * 2;