The correct answer is external motivation.
The American psychologist Robert Sternberg developed a theory proposing five components of creativity. These are: a creative environment, intrinsic motivation, venturous personality, imaginative thinking skills and expertise. A creative environment is by definition a condition which supports the formation of creative ideas, while a person's imaginative skills provide him/her the ability to think outside the box and make innovative connections. In addition, a venturous personality is not intimidated by new and unknown experiences and risks. Finally, a person's intrinsic motivation provides the necessary drive and interest to develop creative ideas, whereas expertise on a specific matter helps a person structure and support these new ideas.
According to this theory, external motivation does not constitute a factor shaping a person's creativity.