The correct answer is (a) True
To explain I would say: Let x be the constant which is multiplied to each term of an A.P., then an’ = an * x and a’ = a * x. So n^th term will be an’ = an * x = (a+(n-1) d) * x = (a * x) + (n-1) d x = a’ + (n-1) x d which is n^th term of an A.P.