Concept:Productive vocabulary means words that a person can actively use in their own speaking and writing.Explanation:Productive vocabulary is also called active vocabulary. It includes words that a learner understands well and can use correctly and confidently in sentences. These words are frequently used in both writing and speaking. In contrast, receptive vocabulary includes words that are recognized when heard or read but are not used actively. Productive vocabulary is smaller than receptive vocabulary, but learners work to expand it by converting passive words into active ones.Answer:A. Words that we use in writing and speaking.