Propaganda may be both positive and negative in viewpoint and effect.
a. true
b. false

If the words "positive" and "negative" here refer to whether propaganda aims to create a positive or negative image, then the answer is :"True".

For example, in Socialist Countries in 1970s a big portion of propaganda was positive, aiming at convincing the citizens that socialism is good for the country. 

C. The contract would likely sever the illegal part of the contract and allow for the contract for the sale of the business to be enforced.

Explanation: The part of the contract which was unknown and illegal ( bald eagle meat in refrigerator) would be expunged from the agreement as they weren't a part of the illegal case. Thus the parties involved in the illegal case prior to the agreement should held responsible and respond to the case accordingly. Once the case is expunged, the sale agreement or contract ( a formal written legal document stating the binding rights between two or more parties, to avoid violation of rights and serves as tenable evidence in any event of breach) can be enforced.