it is c.
the reason y its c is because the number of pages she reads each day equals to 200 pages.
so, it would be the number of pages she reads times the number of days equals to 200 pages.
to flip that, it would be c. 200÷p.
its not a because ur not multiplying 200 by p. ur multiplying the number of pages she reads each day to get 200.
its not b because ur not adding anything in the problem.
its not d because ur multiplying 200 by p. not p divided by 200 because if it was p divided by 200, p would have a smaller amount than the 200 pages.