He had been living his life according to set pattern.

performance
model
conduct
behaviour

The correct answer is C. conduct.

Conduct is a person’s behavior or way of behaving. It can also refer to a person’s moral behavior or character. In this case, the sentence is saying that the person had been living their life in a way that was consistent with their moral beliefs and values.

The other options are not as accurate. Performance refers to how well someone does something, while model refers to a person or thing that is used as an example to be copied. Behavior is a more general term that can refer to any kind of action or activity.

Here are some examples of conduct:

  • Good conduct: A person who is honest, kind, and helpful.
  • Bad conduct: A person who is dishonest, cruel, and selfish.
  • Professional conduct: The way that a person behaves in their job.
  • Ethical conduct: The way that a person behaves in accordance with moral principles.

I hope this helps!