Atomic volume first decreases along the period due to the increase in nuclear charge. However, on moving further along the period, volume decreases as more no. of electrons are added to the same shell resulting in shielding effect which further decreases the effective nuclear charge.

So correct ans is (d).

yes it is correct

because,

first nuclear force of atrraction increases (due to increase in number of proton and electron leads to elctrostatic force of attraction increases) ---- so the size decreases

but further electron electron repulsion increases as the number of electron increases in shell-----so the size increases