In 1972, walter mischel, a professor at stanford university, conducted an experiment in which he offered young children a marshmallow to eat now—or three marshmallows if they could wait for 10 minutes. when mischel followed up on the children in later years, he found that the children who waited had better jobs, higher salaries, and other positive life outcomes.

I believe the answer is: Self-management

Self management refers to the act of controlling our own's behavior in order to sustain our personal well-being.
The children who wait for more marshmallow in the scenario above tend to grow up with a more discipline attitude, which contribute to their likelihood in obtaining better jobs, higher salaries, and other positive life outcomes.

Isay b but i'm not sure.