It was because I was caught in the traffic jam ________ I came to school late this morning.

A. which B. when C. what D. that

It was because I was caught in the traffic jam ________ I came to school late this morning.

1. A.
   which
2. B.
   when
3. C.
   what
4. D.
   that

It was because I was caught in the traffic jam ________ I came to school late this morning.