3.
Principle: Where a person lawfully does anything for another person, or delivers anything to him, not intending to do so or to provide gratuitously, and such other person takes the benefits of that; the latter is bound to compensate the former for something done or thing provided or to restore, the thing so delivered.
Facts: Trader 'A' delivers certain eatables at 'B's house by mistake. 'B' consumed the eatables without asking anything. Which of the following derivations is correct?