Identify the cleft sentence structure in the following options:

Варианты ответа

1. A.The cat sat on the windowsill.
2. B.The book, which I bought yesterday, is on the shelf.
3. C.The movie, watched by millions, won multiple awards.
4. D.It was in the garden that I found the missing keys.верно
5. E.Running late, the train was missed by Sarah.