Elementary Particles: What are the possible charges of a quark (not an antiquark)?
A. -e, 0, e
B. -2/3 e, -1/3 e, +1/3 e, +2/3 e
C. -2/3 e, +1/3 e
D. -1/3 e, +2/3 e
E. -1/3 e, +1/3 e
Answer: D
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