why is VSTP not working for VLAN 100?

Click the Exhibit button.

Based on the output shown in the exhibit, why is VSTP not working for VLAN 100?

A.
No interfaces are assigned to VLAN 100.

B.
Your MSTI is misconfigured.

C.
RSTP is configured in addition to VSTP.

D.
No native VLAN is configured.