A robot trucker will never do (B). The car put itself there and can presumably get itself out again. More importantly, swerving will lead your truck to jackknife and roll in unpredictable ways and cause who knows how much extra damage.

As I've said before about smaller autonomous vehicles, they'll be programmed to always choose the option which is most defensible in court. I will be amazed if we ever see an autonomous vehicle on public roads which does something more complicated than "come to a complete halt as fast as possible while steering for the clearest area of asphalt."