If you need to group 1,000 companies based on their financial characteristics (e.g. total assets, total revenue, costs and profits) and operating characteristics (e.g. employee headcount), you will most likely to use ______ for the task.

A. K-means clustering
B. CART
C. K-Nearest Neighbor

Correct Answer: A

You want to group similar companies but you don't know how to define "similar" in this case - an unsupervised learning approach is appropriate.