Which of the following is sometimes held to be the only event for which there is no cause?

a.freewill
b.emotions
c.viruses
d. moral character

Is it free will not sure

I agree.

The concept of free will is often debated in philosophy and has been argued to be the only event for which there is no cause. While some may argue that emotions, viruses, or moral character can also be events without a specific cause, free will is often considered unique in this aspect. However, it's important to note that the idea of free will and its relationship to causality is complex and can vary depending on different philosophical perspectives.