How is the comma used as an interrupter in this sentence? who in your opinion, won the battle of waterloo?
1) appositive
2)direct address
3)parenthetical expression
4)summary
5)coordinate adjectives preceding a noun

500 books can be produced by one man and a printing press within 5 months, while a copyist can only produce one in the same amount of time

the answer is a. hope this

the viking voyages took place during the middle ages, which was about this time. 500 to 1350. the viking voyages took place during the middle ages, which was about this time.