Correct Answer:
A. Fruitful
Productive means producing good results, achieving a great deal, or yielding a large amount. Fruitful is its closest synonym because it also means producing successful or beneficial results.
Why the other options are incorrect:
- Deserving: Means worthy of something and is unrelated to productive.
- Clear: Means easy to understand or free from obstruction; it is not a synonym of productive.
- None of these: The correct synonym is Fruitful.