Concept: Active vocabulary includes words that a person not only understands but also uses regularly and confidently in daily communication. Explanation: Active vocabulary consists of words we use frequently in speech and writing. These words are easy to recall and apply without hesitation. In contrast, passive vocabulary contains words we recognise but rarely use. Among the given options, only “we use frequently in our daily life” matches the definition of active vocabulary. Answer: Option A: we use frequently in our daily life.