A gospel quartet singing without instrumental accompaniment is called: A. field-holler. B. four soloists C. a capella. D. a small choir.

The correct answer is C. a capella.A gospel quartet singing without instrumental accompaniment is called a capella. The term "a capella" comes from the Italian phrase "in the manner of the chapel," which historically referred to church music sung without instruments. In modern usage, a capella can refer to any vocal music performed without instrumental accompaniment, regardless of the style or genre.