The correct option is A 6 Watt
Emf induced, E=dϕdt=4 V.
Because the flux is increasing into the paper, the current will be in anticlockwise direction.
Hence, the total emf is =8+4−6=6 V in the anticlockwise direction.
So, I=64+2=1 A.
Current is pumped into the battery, so power is supplied to the battery, and it is equal to,
Power =VI=6(1)=6 W