Critical Reasoning

Since it has become known that several executives from a major car manufacturing company have bought cars produced in their own factories, consumers who own models of vehicles manufactured by this company, who had been previously worried by the fact that most models produced by this manufacturer had received poor safety ratings, have been greatly relieved. They reason that, because top executives presumably believe in the safety of the vehicles they use to transport themselves and their families, the safety ratings must have been exaggerated and unreliable. Such reasoning might well be overoptimistic, however, because executives of large companies have been known to purchase their own products in a calculated attempt to dispel threats to their company's reputation.

In the argument given, the two boldfaced portions play which of the following roles?

1. The first describes evidence that has been taken as supporting a conclusion; the second gives a reason for questioning that support.
2. The first describes evidence that has been taken as supporting a conclusion; the second states a contrary conclusion that is the main conclusion of the argument.
3. The first provides evidence in support of the main conclusion of the argument; the second states that conclusion.
4. The first describes the circumstance that the argument as a whole seeks to explain; the second gives the explanation that the argument seeks to establish.
5. The first describes the circumstance that the argument as a whole seeks to explain; the second provides evidence in support of the explanation that the argument seeks to establish.

pl explain your choice. what is conclusion.?? thanks.