Answer:
The main idea of a paragraph is the central point of the paragraph.
Therefore your answer is C.
Hope this helps!
Matchlocks were primed, cartridges rammed home, and swords loosened in their sheaths. Was it the Tuaregs again across our path? But Mohammed, the keen-eyed, shouted joyfully— “The oasis, the oasis! I see the palm-trees.”
this would be the answer because of the way that they are over joyed when they find the Oasis.
Can you please list the paragraph in question?