A can do half of a piece of work in 1 day,where B can do full. B can do half the work as C in 1 day. The ratio of their efficiencies of work is = ?

A can do half of a piece of work in 1 day,where B can do full. B can d

1.	A can do half of a piece of work in 1 day,where B can do full. B can do half the work as C in 1 day. The ratio of their efficiencies of work is = ?
A.	: 2 : 4
B.	: 1 : 4
C.	: 2 : 1
D.	: 4 : 1
Answer» B. : 1 : 4