Three of the Following Are True Statements About Intrinsic and Extrinsic

Three of the following are true statements about intrinsic and extrinsic motivation. Which one is false?

A) High levels of intrinsic motivation during an activity can lead to flow.
B) Extrinsic motivation can be effective when students won't otherwise engage in an activity.
C) Students' intrinsic motivation to learn school subject matter tends to decrease as they get older.
D) Students who have high intrinsic motivation must also have low extrinsic motivation.