AR$12$ This is a crucial question for me$.$ I need the answer urgently. Strict warning: Do not use any AI tools. $"$An electric water heater consists of a perfectly$-$insulated tank filled with water and fitted with an electric heating element. Water enters the tank at $10$C and exits at $50$C at a pressure greater than $1$ atm. The efficiency of the water heating process is defined as the energy provided to the water divided by the electrical energy provided to the heating element. The efficiency of the water heating process is: $($a$)$Much greater than $1($b$)$About equal to $1($c$)$Much less than $1($d$)$Insufficient information.

Answer is b$,$ could you please explain why?"