Both b and c are correct
just simply convert first 8 bits into decimal
range of Class D is (224-239)
option a is starting with 204......so not in class D
option b is starting with 238....so IT IS IN CLASS D
option c is starting with 229...IT IS ALSO IN CLASS D
option d is starting with 245..so it is not in class D
so option b and c are correct;;
