Which of the Following Is an Example of User Innovation

Which of the following is an example of user innovation?

A) Samuel has invented a detachable bicycle in order to make profits by selling it to a reputed bicycle manufacturing firm.
B) Sandra, an engineer, has developed a device that helps track the location of her teenage daughter's car.
C) Jessica, an ace designer for a clothing brand, has been asked to work on a dyeing technique that changes fabric color according to the room temperature.
D) Ivan, a scientist at a reputed pharmaceutical company, has developed an anti-inflammatory drug for the company to commercialize.