Match Column-$I$ and Column-$II$ with the correct relation:

Column-$I$	Column-$II$
$(i)$. Estimation of carbon and hydrogen	$(p)$. $AgX$
$(ii)$. Estimation of nitrogen	$(q)$. $CO_2$ and $H_2O$
$(iii)$. Estimation of halogen	$(r)$. $N_2$
$(iv)$. Estimation of sulphur	$(s)$. $Mg_2P_2O_7$
$(v)$. Estimation of phosphorus	$(t)$. $BaSO_4$

(A) The correct matches are as follows:
$(i)$. Estimation of carbon and hydrogen involves the formation of $CO_2$ and $H_2O$.
$(ii)$. Estimation of nitrogen (Dumas method) involves the collection of $N_2$ gas.
$(iii)$. Estimation of halogen (Carius method) involves the formation of $AgX$ (where $X = Cl, Br, I$).
$(iv)$. Estimation of sulphur (Carius method) involves the formation of $BaSO_4$.
$(v)$. Estimation of phosphorus involves the formation of $Mg_2P_2O_7$.
Therefore,the correct relation is $(i-q, ii-r, iii-p, iv-t, v-s)$.