critical ratios

The following four jobs, A-D, have critical ratios of 1.6, 1.2, 0.3, and 0.4 respectively.

When this rule is utilizing for dispatching, what is the sequence of job execution?

A. D, A, B, C

B. C, D, B, A

C. A, B, C, D

D. D, C, B, A

Answer: C

can one explain why the ans is C

The correct ans is B i.e. C D

The correct ans is B i.e. C D B & A