Respuesta :
"B. Neither light nor moisture is good for food preservation, so most food products are packaged immediately after they are processed." Is the answer that you are looking for this is the only place that a comma could be without messing with the order of the sentence.
The answer for this question would be choice B) or the second option since if you say the other option sentences out loud and hear it, it doesn't sound right due to incorrect punctuation but option B) sounds correct and it has good punctuation and grammar.