Reed always bakes two trays of cookies at a time in his oven. In his oven, two trays of cookies can bake in the same amount of time as one tray.

Yesterday, he baked cookies for 32 minutes. If it takes 16 minutes to bake one tray of cookies, how many trays of cookies did Reed bake yesterday?
A.
1
B.
4
C.
2
D.
6