Correct option is A
Now let's evaluate each option against these conditions:
· Option (a) PQSBCE:
· B and C are together (satisfies condition 1).
· A is not in the group, so no conflict with E or Q (satisfies condition 2).
· D is not in the group, so no conflict with R (satisfies condition 3).
· This group satisfies all conditions.
The only group that satisfies all the conditions is PQSBCE.