Finish the following sentence with the best choice: To make a clear filling for key lime pie

Choices:
- Mix 4 tablespoons of unflavored gelatin half a cup of water and let it sit 20 minutes. Dissolve 2 cups of sugar in 4.5 cups of water and over heat. Remove from the heat, and add the gelatin in water and the key lime extract and mix.
- Mix 4 tablespoons of unflavored gelatin half a cup of water and let it sit 20 minutes. Dissolve 2 cups of sugar in 4.5 cups of water and over heat. Turn up the heat, and add the gelatin in water and the key lime extract and mix.

Answer:
Mix 4 tablespoons of unflavored gelatin half a cup of water and let it sit 20 minutes. Dissolve 2 cups of sugar in 4.5 cups of water and over heat. Remove from the heat, and add the gelatin in water and the key lime extract and mix.