Question custom

3.1 Boundaries - Comma with coordinating conjunctions
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Customers who are satisfied with how a company resolves a service issue may regard that company more positively than they would if no such issue had occurred. This idea is known as the service recovery blank research suggests that it has important impliions for customer loyalty and retention.

Which choice completes the text so that it conforms to the conventions of Standard English?

A.

paradox, 

B.

paradox

C.

paradox, and

D.

paradox and,