Which interface and label path should the operator investigate next?

Refer to the exhibits.

A network operator is troubleshooting packet loss seen from the R1 loopback interface to the R2 loopback interface over the core network. The operator is attempting to identify the next leg in the path from PE1.

Which interface and label path should the operator investigate next?
A . PE1 C Gi0/0/0/3 – forwarding label 24002
B . PE1 C Gi0/0/0/2 – forwarding label 24002
C . PE1 C Gi0/0/0/3 – forwarding label 24001
D . PE1 – Gi0/0/0/2 – forwarding label 24001

Answer: C