The number of teachers and students in five school A, B, C, D and E in a city has been depicted through the given bar graph, where the number of students has been prensented as multiples of ten. Study the bar graph and answer the question that follows.

What is the proportion of the student to teacher ratios across the five school A, B, C, D, E?

A

756:840:900:945:980

B

350:275:287:300:320

C

350:315:294:280:270

D

720:800:926:935:975