Right option of the number of tetrahedral and octahedral voids in hexagonal primitive unit cell are:

The correct option is D $12,6$
For hexagonal primitive unit cell,

$\text{Number of effective atoms per unit cell,}Z=6$

$\therefore \text{Total no. of tetrahedral voids}=2Z$

$=2\times 6$

$=12$

and, Total no. of octahedral voids $=Z$

$=6$

Hence, option (c) is correct.