Every language is distinctive in its vocabulary, grammar, and pronunciation. For example, "IKung" people of South Africa make "click" sounds that are represented by symbols such as "!" as in "!Kung." Some anthropologists study these various sound systems existing in different parts of the world. This study of the distinct sounds within a language is called:
a. Phonology
b. Diglossia study
c. Morphology
d. Syntax study
e. Lexicon study