How does VM-A learn VM-B’s MAC address?

An administrator has created an NSX network as shown in the exhibit:

Both VMs in the exhibit use the same distributed router for their default gateway.
VM-B obtains its IP.address.via DHCP
VM-A wants to send a packet to VM-B.
How does VM-A learn VM-B’s MAC address?

A.
If Host-A is made aware by the NSX Controller of VM-B’s MAC and IP addresses, Host-A replies directly to VM-A with an ARP response.

B.
If Host-A is made aware by Host-B of VM-B’s MAC and IP addresses, Host-A replies directly to VM-A with an ARP response.

C.
If the NSX Controller is made aware by Host-B of VM-B’s MAC and IP addresses, the NSX Controller replies directly to VM-A with an ARP response.

D.
If Host-B.is aware of.VM-B’s MAC and IP addresses, Host-B.is able to reply directly to VM-A with an ARP response.