The thermal energy of a substance is the total amount of energy- potential and kinetic energy contained in it. It depends on the temperature, mass and phase of the substance.
Since, the both the containers contain liquid water at same temperature, greater mass would have greater thermal energy. Thus, container having 1000 mL of water would have greater thermal energy.
I think the correct answer from the choices listed above is the second option. An impact of a thermoelectric power plant on the environment would be it <span>uses a lot of water which will significantly decrease the supply and amount of water available for use. Hope this answers the question. Have a nice day. </span>
