When water falls through a dam and turns a turbine connected
to a generator, electricity is produced. This electricity is often
used to light our homes and offices. Which of the following
shows the energy transformations that occur?
A
Electrical → light → mechanical
B
Chemical → mechanical → electrical
C
Mechanical → chemical → light
D
Mechanical → electrical → light

The energy transformations that occur is Mechanical → electrical → light.

Explanation:

When the water falls through the dam the gravitational potential energy of water is transformed into kinetic energy.This energy rotates the turbine (mechanical energy) connected to a generator.Now this mechanical energy is converted into electrical form through the process of electromagnetic induction (when a conductor cuts the magnetic field, electricity is produced).The electricity thus produced is driven to different offices and houses through wires.By drawing this current we light our homes and offices.