Deductive Logic, Arguments & Fallacies question bank (Critical & Analytical Reasoning)

Weakening Arguments: An author argues in 'Argument Analysis: Identifying Premises, Conclusions and Underlying Assumptions': 'Implementing harsher punitive criminal sentences invariably deters crime because potential offenders weigh penalties rationally.' Which finding most undermines this conclusion?

Analytical Deduction: In 'Argument Analysis: Identifying Premises, Conclusions and Underlying Assumptions': Four law students (A, B, C, D) participate in a moot court. Exactly one of them is the Best Advocate. A says: 'It was B.' B says: 'It was D.' C says: 'It was not me.' D says: 'B is lying.' If only ONE statement is true, who won Best Advocate?