You have two boxes of colored pens. The first box contains a red pen, a blue pen, and green pen. The second box contains a yellow pen, a red pen, and a black pen. What is 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}
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}