Study the given histogram that shows the marks obtained by students in an examination and answer the question that follows.

If the total marks obtained by students be represented as a pie chart, then the central angle corresponding to marks 250 or more but less than 300 is: (correct to the nearest degree)

A

$$188^\circ$$

B

$$88^\circ$$

C

$$68^\circ$$

D

$$128^\circ$$