Which two consecutive whole numbers does 139 lie between? Why?
A. 5 and 6 because 39 falls between 52 = 25 and 62 = 36.
B. 4 and 6 because 39 falls between 42 = 16 and 62 = 36.
C. 6 and 7 because 39 falls between 62 = 36 and 72 = 49,
D. 5 and 7 because 39 falls between 52 = 25 and 72 = 49,