All India Bar Examination (AIBE) 6-VI Previous Year Question Papers with Answers

The correct option is C: Agency 

A contract of agency is a contract in which one party (the principal) authorizes another party (the agent) to act on his behalf and to create legal relations between the principal and third parties. The principle of "He who does an act through another, does it himself" is also known as the doctrine of vicarious liability, which means that the principal is liable for the acts of the agent as if he had done them himself.

A contract of sale is a contract in which one party (the seller) transfers or agrees to transfer the ownership of goods to another party (the buyer) for a price. A contract of purchase is not a legal term, but it may refer to a contract of sale from the buyer's perspective. A contract of partnership is a contract in which two or more persons agree to carry on a business together and share its profits and losses. These contracts are not related to the principle of "He who does an act through another, does it himself".