I agree with the person above.
When there are two objects in a sentence, the grammar rule is that the first one is going to be the indirect one, and the second one the direct one. So, having this in mind, the first object A. customers is the indirect one.
Answer:
I think it is C. but I would wait till someone else answers to be sure :)
Explanation:
B I took the essay lol jk
No it did not start in Spain although it is called the Spanish Flu