What was the city that was the first capital of french louisiana?

Mobile

Explanation:

French Louisiana was part of the massive territory that the French managed to conquer in North America, occupying around one third of what is now the United States of America. French Louisiana was part of New France, a territory stretching from what is now Louisiana up to what is now Indiana. The territory of French Louisiana was larger than that of modern day Louisiana as it was stretching on the territory of Illinois as well. It was a crucial territory though, as it had the most important and actually the only ports, which made it the center of trade during the French rule of this area. The first capital of French Louisiana was Mobile, and it was capital until 1720, when Biloxi became the capital.

yup! you are correct it is b.