The answer is "c. intrinsic motivation".
Intrinsic motivation alludes to conduct that is driven by interior rewards. As such, the motivation to take part in a conduct emerges from inside the individual since it is normally fulfilling to you. This diverges from extrinsic motivation, which includes participating in a conduct so as to acquire external rewards or stay away from discipline.
Intrinsic motivation happens when we act with no conspicuous external rewards. We basically appreciate an action or consider it to be a chance to investigate, learn, and complete our possibilities.