Given:
The water is heated.
To find:
Mode of energy transfer throughout the water.
Step-by-step explanation:
The heat transfer occurs in three ways: conduction, convection, and radiation.
1) Conduction: In conduction, the heat transfer occurs with the transfer of heat through the matter (solid, liquid, gas) without the bulk movement of the matter.
2) Convection: In convection, the heat transfer occurs with the transfer of heat through the fluid (liquid, gas) with the bulk movement of the molecules within the fluid.
3) Radiation: It is a mode of heat transfer in the form of electromagnetic radiation.
Since water is fluid. And, the heat transfer in fluids generally takes place through convection. A correct option is an option (b).
Conclusion:
The correct option is option b: convection.