6(4z - 2)
Distribute the 6 and you have 24z - 12, answer choice a.
For answer choice b, 6 isn’t a factor of 10, so that can’t be right.
For answer choice c, again, 6 isn’t a factor of 10 and then you lost the -12 completely.
For answer choice d, 6 x 4 doesn’t equal 64, and 6 isn’t a factor of 64.