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The passage is primarily concerned with which of the following?
The Serrano tribe is indeed the first tribe to be described in this passage, but the passage does not revolve mainly around it and does not state that the Serrano had control over other tribes.
This answer choice is too general. The passage provides details about specific Native American tribes in one specific desert area: the Joshua Tree National Park area.
In addition, the passage is not restricted to the 1800s only.
This answer choice is too specific because the Mara oasis, although mentioned in the second and fourth paragraphs, is not the primary subject discussed in the passage but a more specific element which is included in it.
This answer choice is limited to the tribes' presence in the Mara oasis area. Since this oasis is only mentioned in two paragraphs, it is too specific to be the main idea of the whole passage.
The first paragraph tells us that several tribes controlled certain areas of what is now the Joshua Tree National Park, and the rest of the passage discusses those tribes in greater detail.