Which Amazon storage do you think is the best for my database-style applications that frequently encounter
many random reads and writes across the dataset?

A.
None of these.

B.
Amazon Instance Storage

C.
Any of these

D.
Amazon EBS

Explanation:
“Amazon EBS is particularly helpful for database-style applications that frequently encounter many random
reads and writes across the data set.”
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/AmazonEBS.html