Answer: It is A.
Step-by-step explanation: The reason why it is A is because what you do first is multiply 40 by 8 because it takes 40 minutes to write one page and there are 8 pages in total. 8 x 40 = 320. Then you divide 320 by 60 because 60 minutes = 1 hour. 320 / 60 = 5.333333 so the answer is between 5 and 6 hours. :)