Concept:An offer must reach the person it is intended for before it can be accepted.
Explanation:For an offer to be valid, it must be communicated to the offeree.
If the offeree does not know about the offer, they cannot accept it.
Without such communication, no binding agreement can be formed.
Having a witness, providing something of value, or directing the offer to only one person are not essential requirements.
Therefore, communication is the key condition for a valid offer.
Answer:D. communicated to the offeree