A Group of Children Who Typically Enjoyed Drawing and Painting

A group of children who typically enjoyed drawing and painting were told that they could earn tokens if they drew and painted pictures of the researcher. They would earn 5 tokens per piece they produced. Overtime, the children who created pieces of art for tokens

A) increased their creativity to earn more tokens.
B) lost interest in drawing and painting pictures.
C) saw the activity as more intrinsically rewarding.
D) become even more interested in drawing and painting.
E) became more proficient in their drawing skills.