@Caitlin Kennedy I'd get rid of Exhibit B. It's overkill. You already submitted all these detailed wedding stuff during AOS. I-751 is to show continuation. To some extent, you can resubmit stuff, but not overkill it by sending same detailed stuff you sent 2 years or so ago.
You need:
1. IRS transcript OR
2. Returns + W2s
You cannot mix and match. Read the instructions. And BTW, USCIS doesn't care if your partner is stay at home. None of their business, provided you live happily and are financially making it. So, no need to prove "productivity."