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You want to create a simulation of the following scenario. The population of school A is made up of 25% 9th graders, 25% 10th graders, 25% 11th graders, and 25% 12th graders. The population of school B is made up of 40% 9th graders, 30% 10th graders, 20% 11th graders, and 10% 12th graders.

What is the best way to assign values for a simulation using a random digits table?

a. School A: 9th grade is represented with 0. 10th grade is represented with 1. 11th grade is represented with 2. 12th grade is represented with 3. All other values are ignored.
School B: 9th grade is represented with 0. 10th grade is represented with 1. 11th grade is represented with 2. 12th grade is represented with 3. All other values are ignored.
b. School A: 9th grade is represented with 0 and 1. 10th grade is represented with 2 and 3. 11th grade is represented with 4 and 5. 12th grade is represented with 6 and 7. 8s and 9s are ignored.
School B: 9th grade is represented with 0, 1, and 2. 10th grade is represented with 3, 4, and 5. 11th grade is represented with 6. 12th grade is represented 7. 8s and 9s are ignored.
c. School A: 9th grade is represented with 0 and 1. 10th grade is represented with 2 and 3. 11th grade is represented with 4 and 5. 12th grade is represented with 6 and 7. 8s and 9s are ignored.
School B: 9th grade is represented with 0 and 1. 10th grade is represented with 2 and 3. 11th grade is represented with 4 and 5. 12th grade is represented with 6 and 7. 8s and 9s are ignored.
d. School A: 9th grade is represented with 0 and 1. 10th grade is represented with 2 and 3. 11th grade is represented with 4 and 5. 12th grade is represented with 6 and 7. 8s and 9s are ignored.
School B: 9th grade is represented with 0, 1, 2, and 3. 10th grade is represented with 4, 5, and 6. 11th grade is represented with 7 and 8. 12th grade is represented with 9.