A customer may find out about a company’s products or services from an ad, a rating website like Yelp, or through the company's site. What are all of these known as?

A. customer proposals
B. customer management
C. customer touchpoints
D. customer turnover

C. customer touchpoints

is this right

Yes, that is correct. These different sources of information where customers may learn about a company's products or services are known as customer touchpoints.