Answer:
D. 9 is the GCF of 9 and 36
Step-by-step explanation:
A. 9 is GCF of 6 and 27❌
Factors of 6: 1, 2, 3, and 6
Factors of 27: 1, 3, 9, and 27
Therefore, 9 is NOT the GCF of 6 and 27.
B. 9 is the GCF of 3 and 21❌
Factors of 3: 1 and 3
Factors of 21: 1, 3, 7, and 21
Therefore, 9 is NOT the GCF of 3 and 21.
C. 9 is the GCF of 3 and 12❌
Factors of 3: 1 and 3
Factors of 12: 1, 2, 3, 4, 6, and 12
Therefore, 9 is NOT the GCF of 3 and 12.
D. 9 is the GCF of 9 and 36✔
Factors of 9: 1, 3, and 9
Factors of 36: 1, 2, 3, 4, 6, 9, 12, 18, and 36
Therefore, 9 is the GCF of 9 and 36.
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