Wind energy or wind power tells the process by which wind that is formed due to presssure difference is used to generate electricity. Wind turbines convert the kinetic energy in the wind into mechanical energy . A generator in wind mill can convert mechanical energy into electricity. Mechanical energy can also be utilized directly for specific tasks such as pumping water as mostly used in earlier times...
You can already eliminate D and E because they are not a part of a sector. The primary sector includes the production of raw materials through intense manual labor.
