Multi-choice problem: Choose from the options at the end, and answer how do you do this: make a box of jello

Choices: a). Whisk together 1 cup of hot water with 1 packet of jello in a large bowl. Add 1 cup of cold water to the mixture and whisk it in. Pour the mixture into a jello mold and add some fruit, if desired. Let the jello set in the refrigerator for 2 to 3 hours, then serve. b). Whisk together 1 quart of hot water with 1 packet of jello in a large bowl. Add 1 cup of cold water to the mixture and whisk it in. Pour the mixture into a jello mold and add some fruit, if desired. Let the jello set in the refrigerator for 2 to 3 hours, then serve.
a).