C-10-Q050mediumsingle_mcqThe charge of a proton is —a+1.6×10−19+1.6 \times 10^{-19}+1.6×10−19 Cb−1.6×10−19-1.6 \times 10^{-19}−1.6×10−19 Cc−9×109-9 \times 10^{9}−9×109 Cdzero