$\begin{array}{1 1} \text{a. Its subatomic particles carry no electrical charge.} \\ \text{b.The positively charged protons cancel out the negatively charged neutrons.} \\ \text{
c.The positively charged neutrons cancel out the negatively charged electrons.} \\ \text{ d. The positively charged protons cancel out the negatively charged electrons.}
\end{array} $
