Concept: The subject "Each one" is singular, so the verb must agree with a singular subject.
Explanation:The sentence is: "Each one of the ten chosen contestants ___ lunch with patron."
"Each one" is the true subject and is singular.
The phrase "of the ten chosen contestants" is a prepositional phrase and does not affect the verb.
Therefore, we need a singular verb form.
(A) "has had" is the present perfect form used with singular subjects.
The other options use plural or non-matching forms: "have had", "have", and "are having".
So the correct choice is "has had".
Answer: A. has had