Why is the label for 1.1.1.1 prefix absent in the R2’s MPLS forwarding table?

Refer to the exhibit.

The R1 and R2 routers are running OSPF, LDP, and BGP. Why is the label for 1.1.1.1 prefix
absent in the R2’s MPLS forwarding table?

A.
IP MTU cannot accommodate labels.

B.
The MPLS tunnel is not enabled for the Fast Ethernet 0/0 interface.

C.
The subnet is not learned via OSPF.

D.
The bgp send-label command is not enabled between R1 and R2.