Question Detail
Question
The category of words to which new words can always be added is called
Correct Answer
Option A is the correct answer.
Detailed Explanation
Nouns, verbs, adjectives, and adverbs belong to the 'open class' because they freely admit new, coined words into their fold over time.
Hint
Think of words like 'google' (as a verb) or 'selfie'. Which word class easily accepts new members?