What feature can be configured on S1 to limit the multicast flooding of traffic to only interested hosts on VLAN 100?

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In the exhibit, Host2 is the only host currently joining group 231.1.1.1, but S1 is still flooding the
traffic to all hosts on VLAN 100.
What feature can be configured on S1 to limit the multicast flooding of traffic to only interested
hosts on VLAN 100?

A.
Multicast scoping

B.
IGMP snooping

C.
Multicast VLAN registration

D.
IGMP immediate leave