Option A will allow us to get to 0.13 version a lot faster than if we were to have to go through various BIPS/refactoring etc due to the complexity of the native coded in Tor part.

Option B will make things a lot more complicated and time consuming causing a heavier workload and excessive spending without a guarantee the work would produce the required end result.There is a possible risk of conflicts and issues down the line also as the codebase is is not vanilla and every further update may require extra work to accomodate the native part etc.

Option C is basically voting for Option A because I can confirm it is the best choice we can make at this stage after many hours of discussions among us all.