Which if the following is a main clause ? a. the poor horse with a broken leg. b. as it was getting dark outside. c. when the time came. d. the veterinarian knew.

D. The veterinarian knew

Hope this helps :)

the author develops a cold, and scared tone. making the reader shudder with fear, and suddenly become cold. i'm guessing that he's writing a scary novel, or maybe about a chilly december night.