Hich of the following is the best source of information about in-person customer interactions and is particularly in gathering specific customer information such as contact information and purchase preferences

A) Sales personnel

Explanation:

The sales personnel is the best souce of information when it comes to customer interactions because they are the ones who interact the most with the clients, they are always talking to the clients and they can get the needed information that can help improve pretty much every aspect that has flaws.

answer; a biased sample;