Concept:Multiplying a 2×2 matrix by a column vector produces a system of equations that can be solved for p.Explanation:Perform the matrix multiplication:[21−34][−6p]=[2(−6)+(−3)p1(−6)+4p]This simplifies to:[−12−3p−6+4p]=[3−26]Equate the first row:−12−3p=3−3p=15p=−5Check with the second row:−6+4p=−264p=−20p=−5Both rows give the same value of p.Answer:p=−5(Option C)