Is Moving air is a source of energy.

Moving air has kinetic energy. Anything that has kinetic energy has the ability to do work. Wind turbines change the kinetic energy of the wind into electrical energy. This form of energy production is also free of pollution.

themselves

an intensive pronoun is a pronoun that ends in self or selves, such as himself, herself, themselves, yourself, ourselves. since band members is a third person plural, the correct intensive pronoun would be themselves. if the band was talked about as a collective noun, itself would be the appropriate intensive pronoun. intensive pronouns are used to add emphasis to the noun it's modifying which is why it directly follows it.

the answer would be c   i believe thats the most reasonable answer