Manner of acceptance refers to whether an offeree accepts an offer by promising, by making a down payment or by performing. Option C is correct
Manner of acceptance can be specified or prescribed by an individual.
This is done to accept offer by a different means other than the ones specified.
The offer that must be prescribed should be the on that is demanded by the offeror.
A manner that that is not prescribed cannot be used.
Therefore, manner of acceptance refers to whether an offeree accepts an offer by promising, by making a down payment or by performing. Option C is correct.
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