From the truth table, Y is 1 only when A=1 (regardless of B). Using K-map simplification: minterms are A'B' (0,0→0), A'B (0,1→0), AB' (1,0→1), AB (1,1→1). The simplified expression is AB + AB' = A(B + B') = A(1) = A. Among the options, AB + AB' (option C) is equivalent to A and matches the truth table output.