Simplfy
4b - [b -(a+b) - {b - (b - a+b)} + 2a]  Choose the correct choice from the following answers.
A) a B) 2a C) 4a D) 0 E) 3b
3bxplanation:   4b-[b-(a+b)-{b-(b-a+b)}+2a]   =4b-[b-a-b-{b-(2b-a)}+2a]   =4b-[-a-{b-2b+a}+2a]   =4b-[-a-{-b+a}+2a]   =4b-[-a+b-a+2a]   =4b-[-2a+b+2a]   =4b-b   =3b   Option 3b
<result>E</result>
Simplfy
4b - [b -(a+b) - {b - (b - a+b)} + 2a]