Sentence 1: Ben and his friend Curly we're going climbing in Venezuela. 
 Sentence 3: They started ascending a narrow staircase to the top 
 Sentence 4:  On the summit, they were surrounded by clouds 
 Sentence 5:  They tried taking a selfie, but all that showed up was fog 
 Option 1: They trekked through the jungle until they reached a cliff. 
 Option 2: They trekked through the jungle until they reached a tall plateau.