Two bodies of mass 1 kg and 3 kg have position vectors$\widehat{i}+2\widehat{j}+\widehat{k}$ and $-3\widehat{i}-2\widehat{j}+\widehat{k}$ , respectively. The centre of mass of this system has a position vector :

Question

( A ) $-2\widehat{i}+2\widehat{k}$
( B ) $-\widehat{i}+\widehat{j}+\widehat{k}$
( C ) $-2\widehat{i}-\widehat{j}+\widehat{k}$
( D ) $2\widehat{i}-\widehat{j}-2\widehat{k}$