Answer:
D. 6(3k+2)
Explanation:
First, let's factor our initial equation to compare to answers A and D. When we factor 3 out, we get the function 3(4k+6) which is equal to A, so we can cross that one off.
Next, let's solve for B and C.
Adding together 4k+8k, we get 12k. adding 20 and -2, we get 18. Therefore, B is 12k+18 which is equal to the initial function. Cross that one off as well!
Next, add 17k and -5k to get 12k, and add 3 and 15 to get 18. That's another 12k+18.
Therefore, the only answer that does not equal the initial function here is D, which actually multiplies out to be 18k+12.