please answer all and leave step by step explaining how you got your answer will give thumbs up

Which of the following best describes the following logical propositione [(pq)(qr)](pr) a) It is a tautology. b) It is neither a tautology nor a contradictian. ci it is a contradiction. Question 15 (5 points) Which of the statements below is a tautology? p=p None of the other answer listed here is a tautolocy. pPpPpP Question 16 ( 5 points) Which of the statements below is NOT a tautology? (pq)pp(pq)(pq)(pq)p(pq)(pq)(pq) Question 17 (5 points) Which statement below is NOT a tatoloty? (pq)(pq)(pq)(pq)(pq)(pq)(pq)(pq)