Among is used with more than 2 reasons. I will say usually I have seen As and for together and not really separate "for" Examples: Among the reasons why I was late to school, I think that oversleeping was the top reason. Reasons could be the alarm and waking up late, missing bus/ ride, and weather and or traffic reasons. Since you were late, you missed out on the lesson (the parts separated with the comma can be reversed. I am only 5'1" because my parents aren't very tall. As the light turned green, I started to drive forward.