Option A would allow me to keep it as a long term rental .

Keep in mind of the I/O(payments/period) and game plan on how fast you'd like to pay it down. 

However, due to keep purchasing real estate, my DTI is high and close to 50%.

I have considered it but I keep things at a flat rate for the exact reasons you stated.I want people to get the exact price when they stay at our lake house.

Own and just keep it as a rental longterm/short term rental?

If you keep the property in your name, but allow her to live in the property, I wouldn't charge her any rent. 

Mostly class B, I'd love to keep them but if there's a great opportunity in the MF world I'm all ears!

It is hard to really keep up with those kinds of trends unless I budget 10k a year in updating the property which I am not going to do.I participate in our local council/mayor meetings.

Quote from @Christian Solis: What business entity should I should I structure my fix and flip business and what are some tips I should should keep in mind so me and my partner are protected ?  

Most land bank properties, Detroit or Wayne County, are trainwrecks and cost more to rehab than they are worth - unless the market keeps improving.Be careful on the next one, but keep improving Detroit!