What Are the Possible Charges of a Quark (Not an Antiquark)

Multiple Choice

What are the possible charges of a quark (not an antiquark) ?

A) $- 2 / 3 e _ { 1 } + 1 / 3 e$
B) $- 2 / 3 e _ { 1 } - 1 / 3 e _ { 1 } + 1 / 3 e _ { 1 } + 2 / 3 e$
C) $- 1 / 3 e _ { 1 } + 2 / 3 e$
D) $- 1 / 3 e _ { , } + 1 / 3 e$
E) $- e , 0 , e$