What does "syntactic" ability encompass?

Syntactic ability primarily refers to the capacity to understand and generate sentence structures, which is why the creation of varied sentence structures is the correct choice. It involves the rules and principles that govern the sentence formation in a language, including the arrangement of words and phrases to create coherent and grammatically correct sentences. This skill is crucial for effective communication, as it enables individuals to express their thoughts in a clear and organized manner.

Other options, while they pertain to language and communication, do not precisely capture the essence of syntactic ability. Understanding vocabulary usage involves semantic knowledge, which relates to meanings rather than structure. Knowledge of grammatical errors is more associated with a person's ability to identify incorrect usage, rather than the ability to create syntax. Interpretation of figurative language calls for a grasp of semantics and context, focusing on meanings that are not literal, which is distinct from the structural focus of syntax.