Since you mentioned you are applying it for the first time, it will be C19.

I have a 15 year old daughter in Mexico, whom I havent seen in 7 years? What visa can she get to come to the US legally?

If you are both undocumented Mexicans in USA, I highly doubt that someone will issue your daughter any kind of visa.

Consequences of divorce on Naturalization after i 751 approval

I do not think there would be any problems, but keep the evidence of your bona fide marriage handy just in case you might need it.

You can write to them asking to withdraw your asylum petition.

Your spouse can have multiple visas in the passport and use any valid visa to enter USA.

You can find out who his supervisor is and write to him or her. However, please not that the issuance of visa is discretionary. It means whether to...

Nobody can prevent you from filing a concurrent petition if you have grounds to do so.

I've recently became a United States Citizen. I submitted an I-130 application and it was approved and sent to the NVC in CA

You should inform NVC of you becoming a US citizen by writing. Then, wait for the instructions on how to proceed from them.

I made a mistake on my G325a form, I added the wrong birthday for my husband's mom. my cases is with nvc. please help.

You could write to NVC, but I would not worry about it for now since it can only delay the case.

Can I refund any payment I made in processing my J-1 visa if I get declined?

You cannot refund the payment from USCIS since they charge it for processing your petition.