I vote "A"
Units in reserve deploy by moving onto the board during the movement phase.
Deepstriking is a subset of this reserves deployment, therefore it should count as 'movement'. While this is not spelled out anywhere per se, it is supported by the 'counts as moving' for purposes of firing weapons, and for landspeeders (count as moving >12"
etc.
An excellent case could be made that normal pre-first-turn deployment is not technically movement, but I find it a bit of a stretch that the 'deployment' by deepstrike wouldn't count as movement.
By the by, no one is forcing the deepstriking unit to move out of the minefield on their following turn. They could just sit pretty and avoid the second 'boom'.