Which of the following is the best example of deductive reasoning? a. all college professors have master's degrees. oren is a college professor, so he must have a master's degree. b. brent needs a new car. he's not sure what he wants, so he goes out and test-drives a few cars before he makes his choice. c. alisha wants to take a class over the summer. she asks friends for suggestions and chooses the class that most of her friends are taking. d. ruby wants to buy a new red jacket but she's not sure which one.