When it is said that an atom is neutrally charged, what does it mean ?

Question

$\begin{array}{1 1} (a)\; \text{the atom contains no charge} \\ (b)\; \text{the atom contains equal numbers of electrons and protons} \\ (c)\;\text{the atom contains more electrons than protons} \\ (d)\; \text{the atom contains more protons than electrons } \end{array}$