A B is Correct
From "view-71-architecture-planning"
A building block consists of physical servers, a vSphere infrastructure, View servers, shared storage, and virtual machine desktops for end users. A building block is a logical construct and should not be sized for more than 2,000 View desktops. Customers usually include up to five building blocks in a View pod,
although in theory you can use more blocks than that, as long as the pod does not go above 10,000 sessions and 7 View Connection Server instances.
Wrong
C. This configuration requires a 64-node cluster per site.
-> vSphere clusters can contain up to 32 ESXi hosts
D. This configuration exceeds the maximum supported size for a View block.
-> A building block is a logical construct and should not be sized for more than 2,000 View desktops.