A person whose head is in the clouds is–

The correct answer is (b) a day dreamer. Idiom: 'Head in the clouds' — describes a person who is out of touch with reality, living in fantasies, or indulging in impractical or unrealistic thoughts and dreams. Example: 'He always has his head in the clouds — he never thinks practically.' Bangla: যে ব্যক্তি বাস্তবতা থেকে বিচ্ছিন্ন, দিবাস্বপ্নে বিভোর। ✗ 'proud' — unrelated; pride is expressed through different idioms (e.g., 'high and mighty'). ✗ 'an aviator' — a pilot; the idiom has nothing to do with flying. ✗ 'a philanthropist' — a person who helps others through charity. Source: Cambridge Idioms Dictionary; Longman Dictionary of English Idioms.