Final answer:
The correct answer is 'a. Intrinsic is to extrinsic'. Self-gratification is to money as intrinsic is to extrinsic.
Step-by-step explanation:
The correct answer is a. Intrinsic is to extrinsic. Intrinsic motivation refers to behavior that is driven by internal rewards, such as personal satisfaction or enjoyment. Similarly, self-gratification is an internal reward that drives motivation. On the other hand, extrinsic motivation refers to behavior that is driven by external rewards, such as money or praise. Therefore, the relationship between self-gratification and money can be compared to the relationship between intrinsic motivation and extrinsic motivation.