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Verified Answer :

Simple....

you have:  4(x+7)

To simplify it..distribute..

4(x+7)

4x=4x
and
4
7=28

Leaving you with...

4x+28

As we can see B is 4x+28

Thus, your answer.

4x+28 is the right answer because you would use the distributive property which makes  4(x+7)------> 4x+28