In the reaction `Me-C-=C-E to overset(Na//liq.NH_(3))(to)Poverset(Br_(2))underset(C Cl_(4))(to)((Q))`, then Q is
A. A pure compound which is optically inactive due to internal compensation
B. A binary mixture which is optically inactive due to external compensation
C. A binary mixture which is optically active
D. A pure compound which is optically inactive due to absence of chiral centre
