What is Lee seeing here?

Lee is using Wireshark to log traffic on his network. He notices a number of packets being directed
to an internal IP from an outside IP where the packets are ICMP and their size is around 65, 536
bytes. What is Lee seeing here?

A.
Lee is seeing activity indicative of a Smurf attack.

B.
Most likely,the ICMP packets are being sent in this manner to attempt IP spoofing.

C.
Lee is seeing a Ping of death attack.

D.
This is not unusual traffic,ICMP packets can be of any size.