The correct option is C willingness to do or abstain from doing and act in order to obtain the assent of other thereto
Section 2 (a) of Indian Contract Act , 1872 defines the term "offer" as when one person signifies to another his willingness to or to abstain from doing something with a view to obtaining the assent of the other to such act or abstinence he is said to a proposal. The person making the offer is called offerer and the person to whom the offer is made is called the offeree.