We will see that in step 6 the distributive property was used, so the correct option is B.
Which property supports statement 6?
The distributive property says that:
A*(B + C) = A*B + A*C
In step 5 we have the equation:
3*(x + 7) = 84
And in step 6, we have:
3x + 21 = 84 (Where remember that 21 = 3*7)
Then we can see that in step 6 the distributive property was used, so the correct option is B.
If you want to learn more about properties:
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