D.

1. It is a nine-digit whole number.

2. It is an even number.

3. Each of its digits appears exactly three times.

4. Each digit is greater than 6.

5. All the digits in each period are the same.

6. It is greater than 800,000,000.

I7. It is divisible by 3.

8. It is divisible by 4

C.

1. It is a six-digit whole number.

2. It has only three different digits, each used twice.

3. None of its digits are even.

4. None of its digits are divisible by 3.

5. It is greater than 600,000.

6. It is divisible by 5.

7. Its tens digit is the same as its hundred-thousands digit.

8. Its thousands digit is the same as its ones digit.

B.

1. It is a four-digit whole number.

2. Each of its digits is odd.

3. None of its digits are repeated.

4. The sum of its tens digit and its hundreds digit is 12.

5. The sum of its ones digit and its thousands digit is 12.

6. It is less than 4,000.

7. Its hundreds digit is greater than its tens digit.

A.

1. It is a three-digit whole number.

2. It is divisible by 5.

3. Its hundreds digit is 8.

4. It is divisible by 3.

5. Its tens digit is less than its ones digit.