Final answer:
The correct answer is B. 3(4x - 8).
Step-by-step explanation:
To factor the expression 12x - 24, we first need to find the greatest common factor (GCF) of the two terms. In this case, the GCF is 12.
So, we can factor out 12 from both terms: 12x - 24 = 12(x - 2).
Therefore, the correct answer is B. 3(4x - 8).