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I also did not file my taxes for five years. In lieu of Option C, I provided them with a letter stating that I did not file my taxes and provided them with my SIN. I also provided them with a copy of my contract which showed my income (I'm self-employed) also I included a print out of my bank savings. I was approved as sponsor within the given timeframe. Later when I ordered my GCMS notes, I can see they did do a back ground check to see if I was or had been receiving Social Assistance ... which I hadn't so I was deemed eligible.

Good luck!
I hope this still works lol. I haven't filled taxes in years but have been nearly constantly employed. I did get all my T4s from CRA for the unfiled years. I plan to do a letter, 12 months of pay statements from my employer, 5 years of T4s and a letter of employment history from my employer.
I will file past years ASAP. I will probably get some money back)