A race course is 400 metres long. A and B run a race and A wins by 5 metres. B and C run over the same course and B wins by 4 metres. C and D run over it and D wins by 16 metres. If Aand D run over it, then who would win and by how much?

A

A, by 8.4 metres

B

D, by 8.4 metres

C

D, by 7.2 metres

D

A, by 7.2 metres