Concept:Productive vocabulary refers to words that a person actively uses in their own speech and writing, as opposed to words they only recognize when hearing or reading them.Explanation:Vocabulary is divided into two types: receptive and productive. Receptive vocabulary includes words you understand when you hear or read them. Productive vocabulary includes words you can confidently use when you speak or write. When you actively produce a word in a sentence, it is part of your productive vocabulary. For example, you may understand many English words while listening, but you only actively use a smaller set of words in your own conversations and essays. Productive vocabulary requires deeper knowledge, such as correct spelling, pronunciation, and grammatical usage.Answer:Option A: Words that we use in writing and speaking.