Remarks: I tried to kinda go a bit all out with this one since I felt a bit uneasy about them giving me a 2nd document request. I had to dig up some of these documents and spent a bit more time preparing it.
I submitted the following documents, combined into a single PDF.
-small cover/explanation letter
-Letter of acknowledgement from the state of Texas about my company registration.
-Receipt from when I made the payment for the company registration, to the state of Texas.
-My credit card statement from that month showing that payment.
-The original form form from when I did the company registration.