A company is planning to migrate its public website to Azure. Which of the following do they need to consider when it comes to hosting their public web site on Azure?

Answer options:

A.They would need to reduce the number of connections to the web site.
B.They would need to deploy a Virtual Private connection from their on-premises site to Azure.
C.They would have to consider paying a monthly cost for the solution.
D.They would need to pay for the user data transfer onto the site.

Answer – C 
If you need to host a web application in Azure, there are a couple of options. But for each option, you have to pay a monthly fee. An example is the pricing model available for Azure Web apps. If you plan on deploying a public website, you would need to consider using a Basic App service plan or higher. 

https://azure.microsoft.com/en-us/pricing/details/app-service/windows/