He had been living his life according to set pattern.

Answer: Option B

Performance : an act of presenting a play, concert, or other form of entertainment.
Model : a three-dimensional representation of a person or thing or of a proposed structure, typically on a smaller scale than the original.
Conduct : the manner in which a person behaves, especially in a particular place or situation.
Behaviour : the way in which one acts or conducts oneself, especially towards others.
Pattern : an arrangement or design regularly found in comparable objects.

Synonym of Pattern is Model