What is one reason to configure a dynamic LACP link aggregation instead of a static link aggregation?

What is one reason to configure a dynamic LACP link aggregation instead of a static link aggregation?
A . so that the link aggregation automatically chooses its operational key
B . so that the link aggregation can detect the system ID and operational key on the other side of each link
C . so that the link aggregation can automatically change a passive LACP interface to active mode
D . so that the link aggregation can include more interfaces with some interfaces on standby

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Answer: B