Correct option is B. $$29$$
We know that,
$$\Rightarrow (1/2)^{-2}=(2/1)^{2}\quad [\because (a/b)^{-n}=(b/a)^n]$$
also, $$\Rightarrow (1/3)^{-2}=(3/1)^{2}\quad [\because (a/b)^{-n}=(b/a)^n]$$
and $$\Rightarrow (1/4)^{-2}=(4/1)^{2}\quad [\because (a/b)^{-n}=(b/a)^n]$$
Now add,
$$=(2)^2 +(3)^2+(4)^2$$
$$=4+9+16$$
$$=29$$