What happens during merging contacts that have contact roles on non-master contacts associated with them?

Answer options:

A.Contact roles are merged when contacts are merged
B.Contact roles will lose their status as the primary contact
C.An error will display prompting you to select the contact role
D.Contact roles will hold the two values from each contact.

Correct Answer: B 
Contact roles on non-master contacts will lose their status as primary contacts when contacts are merged. 
Option A is incorrect because contact roles will not be merged 
Option C is incorrect because we will not have any error related to the contact roles 
Option D is incorrect because a contact role will not be able to hold the two values from each contact upon merging. 
Reference: 

https://help.salesforce.com/articleView?id=contacts_considerations_for_merging_duplicates.htm&type=5