What is played by blowing across the top and is a type of flute?

The correct choice refers to "Quenas," which are traditional Andean flutes played by blowing across the top. They are characterized by their notch design that allows sound to be produced when air is directed into the mouthpiece, similar to how one would play a flute. Quenas are often made from bamboo and have a deep, rich sound, making them a prominent instrument in Andean music.

In contrast, Zampoñas, although also a type of flute, are pan flutes made of multiple tubes and are played by blowing into the top of the tubes rather than across the top of a single body. Teponaztli is a type of slit-drum instrument from Mesoamerica, producing sound through striking, and Mariachi refers to a style of music ensemble from Mexico that typically includes violins, trumpets, and guitars but does not relate to flutes directly. Understanding these distinctions highlights why "Quenas" is the correct answer in this context.