Listening to classical music is a personal preference and can bring immense joy and relaxation to individuals. In this question, the correct answer is option 'C', which is "To".

Understanding the Purpose of Listening
When we listen "to" something, it implies that we are actively engaged in the act of listening and focusing our attention on the object or sound. In this case, the object is classical music. By choosing "To" as the correct preposition, it indicates that the person enjoys actively engaging with classical music and derives pleasure from this particular genre.

Listening to Classical Music
Classical music is a broad genre that encompasses a wide range of compositions from different historical periods, such as the Baroque, Classical, Romantic, and Contemporary eras. It is often characterized by its complexity, rich harmonies, and instrumental arrangements.

Benefits of Listening to Classical Music
Listening to classical music has numerous benefits, including:

1. Relaxation and Stress Relief: Classical music has a calming effect on the mind and body. It can help reduce stress, anxiety, and promote relaxation.

2. Improved Concentration and Focus: The intricate melodies and harmonies in classical music can enhance concentration and focus. Many people find that listening to classical music while studying or working helps them stay focused and productive.

3. Enhanced Mood and Emotional Well-being: Classical music has the power to evoke a wide range of emotions. It can uplift your mood, evoke nostalgia, or even make you feel a sense of awe and wonder.

4. Increased Brain Function and Memory: Research has shown that listening to classical music can stimulate brain activity and improve memory and cognitive function.

5. Cultural Appreciation: Classical music is a significant part of our cultural heritage. By actively listening to classical music, one can develop a deeper appreciation for the art form and its historical significance.

Conclusion
In conclusion, listening to classical music is a personal preference, and the correct preposition to use when expressing this preference is "To". By actively engaging with classical music, individuals can experience the many benefits it offers, such as relaxation, improved concentration, enhanced mood, increased brain function, and a deeper cultural appreciation.

C is correct