Question

HELP ME O.O

Let X = {x|x is a whole number less than 10} , Y = {x|x is an odd number}

What is X *upside down U* Y

A) {1,2,3,4,5,6,7,8,9}
B) {0,2,4,6,8}
C) {1,3,5,7,9}
D) {0,1,2,3,4,5,6,7,8,9}