The Customer Advertises for Project Price Bids Usually When

The customer advertises for project price bids usually when

A) scope of the project is complex, requirements are ill-defined, and bidder qualifications are unknown
B) scope of the project is somewhat simple, requirements are well defined, and bidders are pre-qualified.
C) scope of the project is somewhat simple, requirements are well defined, and bidders are pre-qualified
D) the customer is most interested in learning different contractors' ideas about the project
E) the customer is interested in negotiating with contractor to settle on the best process