Final answer:
a. conversion
The illegal practice of misappropriating and using a client's money is known as conversion. It involves taking property without permission and is a serious legal offense. Embezzlement is a related term and an example of corporate crime.
Step-by-step explanation:
The illegal practice of misappropriation and using the client's money is known as conversion. This term refers to the act of taking someone else's property and converting it to one's own use without the owner's permission. In the context of business or law, conversion is a serious offense and can result in significant legal consequences. When comparing this to the options provided in a similar question regarding corporate crime, an example of corporate crime would be embezzlement, which is the fraudulent taking of personal property by someone to whom it was entrusted, often in a business setting.