Concept: Productive vocabulary includes words that a person actively uses while speaking or writing.
Explanation: Vocabulary is the set of words we understand and use.
It is divided into two types: productive (active) and receptive (passive).
Productive vocabulary refers to words that we regularly use to express our own thoughts in speech and writing.
Receptive vocabulary, on the other hand, includes words we recognize and understand when we hear or read them but may not use ourselves.
Therefore, productive vocabulary is the set of words we actively employ in our own communication.
Answer: B. Words that we use in writing and speaking.