The teacher tested the students. She wanted to see if they remembered what they had learnt.

A. The teacher wanted to see if the students remembered what they had learnt because she tested them.

B. The teacher saw that the students remembered what they had learnt because she tested them.

C. Testing the students, the teacher saw that the students remembered what they had learnt.

D. The teacher tested the students to see if they remembered what they had learnt.