The only thing that could very make B the choice is Clarkson was on his "final warning" with the BBC, now, at one point Clarkson and Andy both own the rights to the show, so in theory, they could take show to another network if the BBC cans JC. But , I also read that JC sold his remaining stake in the show to the BBC, so I am not 100% sure on that part.
This is what supposedly happen
http://www.dailymail.co.uk/news/article-2990616/A-row-steak-luvvie-BBC-boss-wants-Clarkson-Gear-host-said-got-row-producer-finding-hotel-offer-cold-platter-dinner.html#ixzz3U7n5jujR
Second, as of right now, TGUSA has in fact, not been canceled, It just rumors, same as the one that says the show is returning in June of this year.