Read the excerpt from the iroquois constitution how does the figurative language in the sentence supports the purpose of the passage

The excerpt:
“You, the Five Nations Confederate Lords, be firm so that if a tree falls on your joined arms it shall not separate or weaken your hold.”

These are the choices on the internet:
a. It reinforces the Lords’ importance as leaders of the community.
b. It suggests that the Lords must be ready and able to withstand great physical stress.
c. It indicates that the Lords’ commitment to the Five Nations must be unbreakable.
d. It helps to explain the meaning of lordship in the Iroquois world.

The answer should be letter C - "...a tree falls on your joined arms it shall not separate or weaken your hold." means that whatever comes, the commitment must be unbreakable.