Which of the following is an advantage of using an energy-efficient household appliance instead of a traditional household appliance?
A. It works only during the daytime.
B. It uses no electricity
c. It conserves electricity.
D. It does not work as effectively

The answer is c.
conserves electricity

The activity series is shown in the attached picture. if the element is below the other, then you can displace the other. following the activity series as a guide, the reactions are as follows: nickel and aluminum chloride3 ni + 2 alcl₃  → 3 nicl₂ + 2 albarium and copper bromideba + cubr  →  no reaction because cu is less oxidizable than bapotassium nitrate and aluminum3 kno₃ + al  → al(no₃)₃ + 3 ksodium phosphate and zincnaso₄ + zn  → znso₄ + na