The word redact comes from the Latin word redactus.(form of redigō)
Redigō = <em>red-</em> + <em>-agō. </em><em>Red </em>is just an alternate form of <em>re</em>, which means "again" <em>Agō </em>means to do, act, make, move, discuss, etc.
Together, the word redigō means to collect, reduce, or <u>bring back</u>.
Thus, the answer is B.
<em>*In Modern English, redact is usually used to refer to blacking something out on the release of a document.</em>