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The following steps describe the process of generating electricity by burning coal in a power plant.

1. The coal fire converts to liquid water to steam.

2. The steam rotates fan like blades of a mechanical turbine.

3. The shaft of the turbine spins an electric generator.

4. The electric power is delivered to the consumer over long-distance power lines.

Which energy transformation occurs during this process?

A. Nuclear energy of the steam is converted to thermal energy of the turbine.
B. Mechanical energy from the turbine is converted to electric energy in the energy in the generator.

C. Electric energy from the generator is converted to chemical energy in the power lines.

D. Chemical energy from the generator is converted to electric energy in the power lines.

I am not cheating but I think my teacher accidentally marked this question wrong when it was right.
Explanation please!