Why is it important to specifically state everything you need from suppliers when you are creating an RFP$?$

$$ A$)$ To make the proposal more informational than analytical

B$)$ To put the requirements in context

C$)$ The potential bidders need the information to write a better proposal

D$)$ To outline the key pieces of information that should be included in the proposal

$$ E$)$ The proposal process will eventually lead to a contract for delivery of the service