Which of the following constitutes a reason for the beginning of the Mongol invasions under Chinggis Khan?

Question

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The Mongol invasions under Chinggis Khan were partly motivated by the need to find new grazing lands for their herds. The Mongols were a nomadic people who relied heavily on their animals for sustenance, and as their population and herds grew, they required more land to sustain them. This need for additional resources drove them to expand their territory through invasions.

Which of the Following Constitutes a Reason for the Beginning