Which of the following is the correct spelling of the word?

Correct option is A

Option (a) is correctly spelt word.
Correct spelling is: “ Aesthetic — relating to beauty, taste, and the principles of artistic appreciation; also a set of artistic principles/ style.” (हिंदी: सौंदर्यपरक, सौंदर्य संबंधी, रूप-रस से जुड़ा).
Example: The gallery’s minimalist aesthetic emphasizes clean lines and natural light.