Which is a criterion for refusal of admission at CBP?

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Admission at the border relies on meeting immigration requirements, especially having a valid visa appropriate for the visit. If someone does not meet these visa requirements—no visa, an expired visa, a visa that doesn’t cover the intended activity, or lacking necessary supporting documents—CBP can refuse admission. The other options don’t establish a formal ground for denial: a friendly demeanor is positive but not a disqualifier, travel itinerary accuracy by itself isn’t a denial criterion, and a positive travel history can help credibility but doesn’t automatically cause denial.