The correct answer is: B. The energy of steam was discovered by James Watt.
The other options are incorrect because they do not make sense in the context of the question. For example, option A, “The energy of steam discovered James Watt,” is incorrect because it is impossible for energy to discover a person. Option C, “James Watt was discovered by the energy of steam,” is also incorrect because it is impossible for a person to be discovered by energy. Option D, “James Watt had discovered energy by the steam,” is incorrect because it is unclear what the word “energy” means in this context.
The energy of steam is a type of potential energy that is stored in the steam. When the steam is released, it can be used to do work. James Watt was a Scottish inventor who is credited with inventing the steam engine. The steam engine is a machine that uses the energy of steam to do work.