A student is preparing 0.5 L of a 0.1 M magnesium chloride solution. The student uses the following steps to get started.

Step 1: Gather a graduated cylinder, balance, and stirring rod.
Step 2: Calculate the number of moles of magnesium chloride needed.
Step 3: Add the water to reach 0.5 L of magnesium chloride solution and stir until dissolved.
Step 4: Label the solution 0.1 M MgCl2.
The process as described is incomplete. What would fix the process so that it is accurate?

A) The student made a mistake in Step 3 by adding enough water to reach 0.5 L of water. Exactly 0.5 L of water should have been added.

B) The student made a mistake in Step 1 by getting a graduated cylinder. The student should have gotten a beaker.

C) The student made a mistake in Step 4 by labeling the solution 0.1 M MgCl2. It should be 0.1 g MgCl2.

D) The student made a mistake in Step 2 by calculating the moles of magnesium chloride. The grams should be measured to make the solution.