💡 Detailed Explanation
Translation: My older brother is reading a book in his room now.
- Grammatical point: Present continuous '〜ています'.
- Explanation: To express an action in progress, use the Te-form of the verb followed by 'います'. The verb is 読む (よむ - to read), and its Te-form is 'よんで' (yonde).
- Other choices are incorrect for forming the present continuous.