Consider a continuous-time system with input x(t) & output y(t) are related by y(t) = x (sin t). This system is
(A) causal & linear (B) non-causal & linear
(C) causal & non-linear (D) non-causal & non-linear
(A) causal & linear (B) non-causal & linear
(C) causal & non-linear (D) non-causal & non-linear