George’s cat had a litter of seven kittens. Four of the kittens are male. Three are female. Which set of symbols correctly describes the gender of the kittens?

A

XX, XX, XX, XX, XY, XY, XY

B

XY, XY, XY, XY, XX, XX, XX

C

Y, Y, Y, Y, X, X, X

D

X, X, X, X, Y, Y, Y