The Correlation Between the Foot Lengths of Fathers and Their

The correlation between the foot lengths of fathers and their (adult) sons, measured in inches, is r = 0.92.
If fathers' foot lengths were measured in millimeters (1 inch = 25.4 millimeters) , and sons' foot lengths were measured in furlongs (one furlong equals 7,920 inches) , the correlation between foot lengths of fathers and sons would be:

A) much smaller that 0.92.
B) slightly smaller than 0.92.
C) unchanged: equal to 0.92.
D) slightly larger than 0.92.
E) much larger that 0.92.