Which of the following instruments is a Mexican slit drum made from hardwood?

The Teponaztli is indeed a Mexican slit drum crafted from hardwood, characterized by its distinct sound and construction. It features a hollowed-out body with two slits on the top surface that produce different pitches when struck. This traditional instrument holds cultural significance in various indigenous Mexican communities, often used in ceremonial contexts and festivities.

In contrast, the other options do not fit the description of a slit drum made from hardwood. The conch is a mollusk shell used as a horn or musical instrument, typically producing a powerful blowing sound rather than functioning as a drum. The rasp, usually made from a notched stick or wooden instrument, creates sound through friction rather than striking, while the huehueti is a large, ceremonial drum often associated with Aztec culture but does not have the slit design characteristic of the Teponaztli.