At cooper high school, jazz band is only offered as a zero-hour (before school) class. dan has a zero-hour class. conjecture: dan is in jazz band. use deductive reasoning to verify the conjecture, or provide a counterexample if the conjecture is false. a. true; law of detachment b. true; law of syllogism c. false; dan may be enrolled in a different zero-hour class d. false; dan can never be in jazz band