Prime Numbers

1. Which of the following is prime?
A - 4
B - 6
C - 7
D - 8

2. Which of the following is prime?
A - 4
B - 5
C - 10
D - 19

3. Which of the following is prime?
A - 2
B - 12
C - 4
D - 9

4. Which of the following is prime?
A - 15
B - 9
C - 20
D - 7

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