Given below are four jumbled sentences. Out of the given options pick the one that gives their correct order.

A. But once when Mark disturbed the whole class with his pranks I had to reprimand him.

B. He was in third grade when I taught at Saint Mary's School.

C. All 34 students were dear to me, but Mark Eklund, was one in a million.

D. He had a happy-to-be-alive attitude that made even his occasional mischievousness delightful.