When should you use commas or dashes to set off an appositive phrase
a, when it is essential to understand the sentence
b, when its not essential to understand the sentence
c, all the time
d, only when the appositive is a pronun

Which line from the story of my life by helen keller is an example of a simile? during the whole trip i did not have one fit of temper, there were so many things to keep my mind and fingers busy. i was like that ship before my education began, only i was without compass or sounding-line, and had no way of knowing how near the harbour was. one day, while i was playing with my new doll, miss sullivan put my big rag doll into my lap also, spelled "d-o-l-l" and tried to make me understand that "d-o-l-l" applied to both. child as i was, i at once felt the tenderness and sympathy which endeared dr. bell to so many hearts, as his wonderful achievements enlist their admiration.