Suppose two genes a and b are 7.4 map units from each other, and that genes b and c are 5.7 map units from each other. You do a cross to determine the map distance between a and c. Which result would indicate that c lies between a and b?
A) 2.0 map units B) 10.1 map units C) 14.8 map units D) 15.0 map units