Refer to the Exhibit.

the cluster Actions menu, as shown in the Exhibit.
Which option is used to create a VVOL on an existing VVOL container?

A.
Storage

B.
Deploy OVF Template

C.
New vApp

D.
Settings

Explanation:

A storage container is the storage that is available physically on your storage array. Now I say physically but this could also be virtually presented storage even on an ESXi host but somewhere somehow it will be back-ended on some physical medium, be it HDD, SSD or hey, maybe even a super fast memory disk. Basically it’s a chunkof physical storage somewhere. Capacity Pools are logical partitions carved out of these to provide a chunk of storage to your VM Admins. Capacity pools may also span multiple storage arrays even across sites. Now you could have a single capacity pool within your storage container or multiple depending on your requirements if you need some sort of logical separation for say separate tenants or separate VM admins needing their own separate chunk of storage but just simply think of it as a chunk of storage presented to your VM admins.
Reference: http://www.wooditwork.com/2012/10/29/vmware-vvolumes-the-game-changing-future-for-storageis-demoed/