PLEASE HELP I WILL MARK BRAINLIEST :)

B

Explanation:
(75 + 90)/250 = 0.66 = 66% of students are 11 or 12
5/250 = 0.02 = 2% of students are 10
(90 + 70)/250 = 0.64 = 64% of students are 12 or 13
10/250 = 0.04 = 4% of students are 14

“exterior angles of triangles. an exterior (or external) angle is the angle between one side of a triangle and the extension of an adjacent side. try this drag the orange dots on any vertex to reshape the triangle.” look to get to the answer i explained what it means and other things i hope it you .