What does semantics pertain to in the context of language?

Semantics is the branch of linguistics concerned with meaning. In the context of language, it specifically deals with how words, phrases, and sentences convey meaning. Understanding semantics involves exploring the meanings of individual words as well as how those meanings combine in larger units of language, such as idiomatic expressions and sentences, to create a coherent message.

The other options focus on different aspects of language. For instance, the structure of sentences relates to syntax, which involves the rules and principles that govern the construction of sentences. The sound systems of languages are covered under phonetics and phonology, which study the sounds used in speech. Finally, regional variations pertain to dialects and sociolects, which highlight how language can differ based on geographical or social contexts. Each of these areas contributes to a comprehensive understanding of language, but semantics specifically focuses on meaning, making it the appropriate choice in this context.