Wakai mein yaar, whats all this....
The only way v can proceed is by choosing the smaller sized elements to pack in CCP, n the bigger ones as BCC with 12 & 8 as respective coordination no.s.
So, probably, answers shud be like-
A)-p,r
B)-p,r or q,s depends upon which lattice Cu makes.
C)-q,s
D)-q,s