Khalil has a flock of sheep that he has just paid the vet a huge amount of money to deworm. Within just a few months, Khalil’s sheep are once again infested with them. What can Khalil do to hopefully prevent the sheep from picking up worms after they are treated this time? A.
Put goats in the field with them because they will repel worms.

B.
Change their feed because that is where they are getting worms.

C.
Make sure that there is no standing water in their pasture that could contain protozoa.

D.
Change the pasture they are in because the first one is contaminated.