In the bcc packing, the space occupies is 68% of the total volume available while in ccp, the space occupied is 74%. This means that for the same volume masses of bcc and ccp are in the ratio of 68 : 74. As the volume is same, ratio of density is also same viz 68 : 74

$\large\frac{d_{bcc}}{d_{ccp}}=\frac{68}{74}=$$0.919$

Hence (B) is the correct answer.