Which web tier plan should you recommend?

Your company has a subscription to Azure. You plan to deploy 10 websites.
You have the following requirements:
Each website has at least 15 GB of storage.
All websites can use azurewebsite.net.
You need to deploy the 10 websites while minimizing costs.
Which web tier plan should you recommend?

A.
Free

B.
Small Business

C.
Standard

D.
Basic

Explanation:
http://msdn.microsoft.com/en-us/library/dn787017.aspx