The correct answer is C) rocks, trees, mountains, and other landmarks.
Land grant boundaries often consisted of rocks, trees, mountains, and other landmarks.
In the old times of the State of New Mexico, people tried to protect their lands from invasions. The easier way to protect property were natural barriers such as rocks, trees, mountains, and even rivers or lakes. In this place, people formed community grants. These grants established settlements for homes and community land to be farmed. Land boundaries were effective to fend off other Indian tribes and foreigners.