Answer:
2
Step-by-step explanation:
Factors of 8: 1, 2, 4, 8
Factors of 14: 1, 2, 7, 14
Factors of 12: 1, 2, 3, 4, 6, 12
Factors of 6: 1, 2, 3, 6
Therefore, the greatest common factor of 8, 14, 12, and 6 is 2.