If a student never skips a class and gets an overall mark of 80 （out of 100) for assignmen

If a student never skips a class and gets an overall mark of 80 (out of 100) for assignments, what is the minimum mark that the student must obtain in the final exam in order to get 85 (out of 100) as the final mark of the course？

A．80.

B．85.

C．90

D．95