Concept:Vocabulary is divided into active and passive types. Active vocabulary includes words that a person uses regularly and understands fully in different situations.Explanation:Active vocabulary are words we use in speaking and writing. We know their exact meanings and how to use them correctly. These words are easy to recall and apply confidently. For example, when we talk or write, we choose these words naturally. Active vocabulary is smaller than passive vocabulary, which includes words we recognise but cannot produce easily. Learners work to convert passive words into active ones. Therefore, active vocabulary is defined as words we use in different contexts and understand their meanings and usages.Answer:Option A