Select the correct article: ____ Everest is the highest peak.

Concept: A proper noun that names one specific, unique entity — a particular mountain peak, a particular person, most countries and cities — normally takes no article at all in English, because the name alone already identifies exactly one thing. Mountain RANGES are the exception: a range name refers to a collective group of peaks, so it takes the definite article "the" (the Himalayas, the Alps, the Rockies).

Application: "Everest" is the name of one specific peak, not a range, so it follows the individual-peak rule and needs no article at all — "Everest is the highest peak" is correct exactly as written, matching "No article".

• "A": the indefinite article introduces a general, not-yet-identified member of a class ("a peak"); it cannot precede a name that already refers to one specific, known mountain.

• "An": the indefinite article used before a vowel sound, again for a non-specific member of a class; a name that is already definite and unique does not take it.

• "The": reserved for a range's collective name (e.g. "the Himalayas") or for a noun made specific by earlier context — not for a peak's own standalone proper name.

Cross-check: compare with a range — "the Himalayas are a mountain range" needs "the" because the name is collective, while the individual peaks inside it, such as Everest or K2, take no article at all.