Consider the following propositions and choose the correct alternative. I. 20% of 40 is 8 and 5% of 50 is 2.5. II. 15% of 50 is 7.5 or 12% of 80 is 9.6. III. either 7 is prime or 13 is prime. IV. If 5 is not even, then 15 is odd. V. 8 is not prime if and only if 2 is prime. Choose an answer. a) Either II is true or IV is true. b) Either I is true or V is true. c) Either III is true or IV is false. d) Either I is false or III is true. e) either III is false or IV is false.