Semantics deals with understanding the meaning of words and word combinations. Thus, option B 'words . . . word combinations' is the correct answer.
Semantics refers to the study of meaning; Semantics can be described as the study of the meaning of words, phrases, and sentences. In semantics, there is always an attempt to deal with what the words conventionally mean, instead of what an individual speaker might want them to mean on a specific occasion. Semantics focuses on explaining how words and sentences are understood by native speakers.
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