How do you plan to solve it?
module selector3 ( input [7:0] a, input [7:0] b, input [7:0] c, input [1:0] sel, output reg [7:0] y ); always @* begin y = 8'd0; if ( sel === 2'b00 ) y = a; else if ( sel === 2'b01 ) y = b; else if ( sel === 2'b10 ) y = c; end endmodule