Source documents and coding

Are each of the following statement used in the material control cycle, true or false?
1) a material requisition will be completed when materials are needed from stores by a production department.

2) a purchase order is sent to the purchasing department to request that materials be ordered from a supplier.

3) a goods received note is sent to the supplier to confirm that goods have been received.

True False
A: (1 and 2) (3)
B: (2 and 3) (1)
C: (1) (2 and 3)
D: (1 and 3) (2)

The correct answer is C in the bpp kit. I want to clear my concept why not D?