Answer
D
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.
