c. is the correct answer. The route skips over Sinope and instead visits neighboring cities.
Know that in the typical dictionary, it says on the top left of each page the first word on the page, and on the top right of each page the last word on the page. This shows the reader what words are on the page, and lets him know if he has reached the page with the word he is looking for, or if he has to go forward/back.
The answer is September 17 , 1787.