The rock was weathered by water, sand, and other rocks
        
             
        
        
        
I would go with D) Mob because if its a negative connotation than mob would be the right answer because an assembly is not negative, not a gathering, and not a group because those could be BOTH positive AND negative but we want to find ONLY negative so mob because mobs are big groups of violent crazy people causing chaos.
        
                    
             
        
        
        
E. He wouldn’t readily reveal his feelings.