The conduct or manner of enactment towards others is defined as behavior. Behavior becomes a habit when it has been repeated 21 times. Thus, option c is correct.
Behavior has been defined as the manner of conduct and the way the person or an organism shows or acts around the other organism in general or specific situations.
On the other hand, a habit has been defined as a practice or a routine that an organism shows daily and has become part of its lifestyle. It can also be said as a regular form of behavior.
It takes around 20 - 250 days or 21 times for a behavior to become a habit. As behavior is a manner of conduct that when gets continuously repeated over and over becomes the intrinsic part of the daily routine.
Therefore, option c. it takes 21 times for a behavior to become a habit.
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