Each up quark has a charge of +2/3.
Each down quark has a charge of -1/3.
The sum of the charges of quarks determine the particle's electrical charge.
In this case:
2(+2/3) + 1(-1/3) = particle charge
4/3 - 1/3 = particle charge
Particle Charge = +1 E
Answer is C) +E
