A. is correct
First initiative check roll(s) are made.
Player1 rolls: 10
Player2 has recon and rolls: 8 and 2
then initiative is determined.
Player1: has init check of 10 with Tactician +4 = 14
Player2: chooses init check of 2 (cause he is a sneaky snake)
After initiative is determined Player2 uses Sense the Future to "swap" initiative checks.
Player1: gets init check of 2 with Tactician +4 = 6 (modifiers to the result still apply to the owner's own check.)
Player2: gets init check of 10
Player2 has won initiative.