The study of how language is related to culture and the social uses of speech is called:Group of answer choicesSociolinguisticsGrammarPhonologyMorphology

The study of how language is related to culture and the social uses of speech is called Sociolinguistics.

Sociolinguistics investigates how language varies and changes in social groups, and it examines the interplay between language and societal factors such as class, gender, ethnicity, and cultural identity. It looks into aspects like dialects, language policy, language shift, and the social functions of language.

The other options — Grammar, Phonology, and Morphology — refer to different branches of linguistics. Grammar encompasses the rules governing language structure; Phonology studies the sounds in a particular language; and Morphology focuses on the structure of words and the formation of word components. Therefore, the correct answer to the question is Sociolinguistics.