A valid offer includes:

Multiple Choice

preliminary negotiations and advertisements.

vague and ambiguous proposals.

expressions of possible interest by the offeror.

offers communicated by the offeror to the offeree's agent.

$4$ Juan, Dwayne, and Sonia are co$-$workers. Juan overhears Dwayne's offer to sell an antique car to Sonia for $$15,000.$ Under these circumstances,

$800$:$03$:$46$

Multiple Choice

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Sonia cannot make a counteroffer to Dwayne to buy the car for $$12,500.$

Juan makes a new offer to Dwayne when he offers to buy the car for $$15,000.$

Dwayne cannot make a new offer to sell the car for $$15,500$ to Juan.

Juan accepts the original offer made to Sonia when he accepts to buy the car from Dwayne for $$15,000.$