How does this affect the Multiple Spanning Tree Protocol (MSTP) topology?

Refer to the Exhibit.

Originally, all four switches had the same region configuration. VLAN 14 was added to Switch_D and then mapped to instance 2.

How does this affect the Multiple Spanning Tree Protocol (MSTP) topology?
A . Load sharing is lost; one of the uplinks is blocked for all traffic on Switch_
C . All connectivity is lost; both uplinks are blocked on Switch_
E . A Layer 2 loop exists and will cause sporadic connectivity issues.
F . Load sharing is lost; one of the uplinks is blocked for all traffic on Switch_C and Switch_

Answer: B