Awelding torch produces a flame by burning acetylene fuel in the presence of oxygen. the energy released from the acetylene fuel is then used to melt a metal.

which energy transformation happens during this process?
a) chemical energy turns into thermal energy.
b) kinetic energy turns into potential energy.
c) thermal energy turns into electromagnetic energy.
d) potential energy turns into chemical energy.

well the answer is A because:

The acetylene fuel has stored chemical energy that is released when you burn it that energy is released in the form of thermal energy

The correct option is A.

Energy has been defined as the ability to do work. The process of producing energy by burning acetylene fuel in the presence of oxygen is a chemical process. Melting of metal involved applying heat [thermal energy] to a substance in order to break down the structure of the substance. Therefore, in the question given above, the energy transformation that occurred is the conversion of chemical energy into thermal energy.