Cerium can show the oxidation state of $+4$ because

Which of the following orders of atomic radii are correct:-

Correct answer is:-

$\text{(a) }\mathrm{Li}<\mathrm{Be}<\mathrm{Na}$

$\text{(b) }\mathrm{Ni}<\mathrm{Cu}<\mathrm{Zn}$

$\text{(c) }\mathrm{Ti}>\mathrm{V}>\mathrm{Cr}$

$\text{(d) }\mathrm{Ti}>\mathrm{Zr}\approx \mathrm{Hf}$