Mike's Small Company Produces Specialised Hardware Pieces

Mike's small company produces specialised hardware pieces.His industrial clients prefer to purchase these parts from Mike because

A) large companies do not manufacture small parts.
B) they cannot produce such high-quality parts.
C) it is cheaper to buy from Mike than to make the parts themselves.
D) large companies prefer to have less control over their operations.
E) buying from Mike will help increase their expenses for tax purposes.