A.Option B

B.Option A

C.Option C

A.Option B

B.Option C

C.Option A

A.Turbogenerators were developed in the nineteenth century.

B.Electrical energy is less valuable than heat energy,

C.Turbogenerators must have steam in order to operate.

D.Wind turbines are inefficient at present.

A.Option B

B.Option A

C.Option C

A."The Production of Electricity"

B."Primary Energy Sources"

C."Simple Generators"

D."The Value of Electricity"