Concept:Substitute the given values into the expression and simplify, working out the bracket and the power first (BODMAS).Given:p=2, q=43Solution:p2(q−1)=(2)2(43−1)Power: 22=4Bracket: 43−1=43−44=−41Multiply: 4×(−41)=−1Key point:q−1 is negative because q is less than 1, so the answer is −1, not 1.Answer:Option C (−1)