Language is made up of basic sounds called

A) vowels.
B) syllables.
C) phonemes.
D) morphemes.

Language is composed of phonemes, which are the basic sounds that make up words. Vowels and syllables are important components of words, but they are not the smallest units of sound. Morphemes, on the other hand, are the smallest units of meaning in language, but they are not necessarily the smallest units of sound. Therefore, the best choice is C) phonemes.