HELP ITS REALLY URGENT

The correct phrase to describe the Ancestral Puebloan Culture and the Mississippian Culture were:
It is not known for certain, the reason why the Ancestral Puebloan Culture declined and then disappeared. A commonly stated reason however, is that the Ancestral Puebloan Culture declined as a result of drought and other weather changes.
The Mississippi Culture on the other hand went through a decline as a result of Europeans coming in contact with them. Even though they were already on the decline, the Europeans led to their culture disappearing faster.
In conclusion, option C is correct.
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