![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
The equation is 4 + 6(ac + 2b) + 2ac.
\ \= 4 + 6(ac) + 6(2b) + 2ac (Distributive Property : a (b + c) = ab + ac)
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= 4 + 6ac + 12b + 2ac (Multiply: 6(2b) = 12b)
\= 6ac + 2ac + 12b + 4 (Commutative Property: a + b = b + a)
\![\"\"](\"/userfiles/image/steps_images/step2.JPG\")
= (6ac + 2ac) + 12b + 4 (Associative Property of Addition)
\= (6 + 2)ac + 12b + 4 (Distributive property: a (b + c) = ab + ac)
\= 8ac + 12b + 4 (Add: 6 + 2 = 8)
\![\"\"](\"/userfiles/image/steps_images/solution.JPG\")
Option A is right choice.
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