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.
C) Alienate
All the other choices don't make sense...
It would be
A. the dashes Dickinson uses
Hope this helps