Context: The passage below describes an experiment. Read the passage and think about the variables that are described.

Dominic designed an electric circuit to test how well different types of metal conduct electricity. The circuit included a battery, a light bulb, wires, and clips that could be attached to a sheet of metal. If the metal conducted electricity poorly, the light bulb would appear dim. If the metal conducted electricity well, the light bulb would appear bright.
Dominic collected nine equally sized sheets of metal: three sheets of copper, three sheets of iron, and three sheets of aluminum. He used the clips to attach each metal sheet, one sheet at a time, to the circuit. For each sheet, Dominic used a light meter to measure how much light the bulb produced.
Hint: An independent variable is a variable whose effect you are investigating. A dependent variable is a variable that you measure.
Figure: clips attached to a sheet of copper in a circuit.
Which of the following was a dependent variable in this experiment?
A. the amount of light produced by the light bulb
B. the type of metal sheet used in the circuit
Pick the correct answer from the listed options and provide the letter of the selected option.

A