What could be the reason?

Material

You want to create purchase requisition for the material used in your project. However after releasing the project, no purchase requisition has been created.

What could be the reason? Note: there are 2 correct answers for this question.
A . The procurement type in the material master is set to in-house Production.
B . The item category of the materials is set tstock item.
C . The material have no material number.
D . The item category of the materials is set tnon-stock item.

Answer: A,B