You are working on a science experiment. The protocol for recording science experiments is to use passive voice in the records. With that in mind, which of these choices works best as an opening sentence? A) We added three ounces of potassium cyanide to 1/2 cup of skim milk. B) First of all, we measured out three ounces of potassium cyanide. C) Three ounces of potassium cyanide were added to 1/2 cup of skim milk. D) We got a gallon of skim milk out of the refrigerator and poured it into a cup.