If (P3,P4) share a flat, then the other flat P4 shares will be
B
From the given passage, we can conclude that
A -- P1
B -- P2
C -- not P4
D -- not P1 and P4
E -- not P2
If P3 and P4 are sharing flat, then
A -- P1 and P5
B -- P2 and P4
C -- P1 and P3
D -- P5 and P2
E -- P3 and P4