What is the author's main purpose in writing this passage? to give facts about a valuable invention and its impact on diving
to explain the differences between the Aqua-Lung and Le Prieur's invention
to describe how diving has changed and improved over the years
to make readers question Cousteau's contribution to the world of diving

the anecdote makes readers feel sorry for the man’s lack of heritage, then reminds readers that the man has an equally valuable heritage.

in my opinion, ap calculus was the most difficult. i often struggled with it a lot. however, i have gotten a lot better.

b is the answer.   i sat on the lumpy sofa, totally exhausted, with a bad taste in my mouth, wondering what i should do next.  

where is the sentence at?