Work Step by Step
Option A is incorrect. The owner used kilograms, which is a measure of mass in the metric system. Option B is incorrect. The owner recorded data on a chart. Option C is incorrect. The owner could easily graph the data using a line graph. Option D is correct. This experiment was not controlled. If it were controlled, then there would be a control group in which another puppy similar to the puppy in question was given another type of food.