(d)
Metals and non-metals combine to complete their octet. Since, non-metals have lack of electrons, in order to complete their octet, they gain electrons, consequently, the size of non-metal atom will increase.
$Metal + Non - metal \longrightarrow Electrovalent\ bond$
$\left( Na^{+} \right)\ \ \ \ \ \ \ \ \ (Cl)\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ NaCl\ \ \ \ \ \ \ \$