Question

H-E-L-P-M-E !!!

You have one box of a red pen, a blue pen, and a green pen. The other box contains a yellow pen, a red pen, and a black pen. What os the set that represents all the pens?

A) {red pen, blue pen, green pen}
B) {red pen}
C) {red pen, red pen, green pen, yellow pen, black pen}
D) {red pen, blue pen, green pen, yellow pen,black pen}