Whatever they order is going to get cancelled anyway, so the whole argument is pointless
However, they will order the - B. and then cancel it. Why? Because as its the more expensive aircraft, they will be able to announce bigger savings when its chopped.
Of course they'll be able to offer an earlier saving by not buying the catapults.
So ....first they announce the most expensive carrier option - and then pull back, so saving a fortune that they were never going to spend anyway, and then they save an even bigger fortune by not buying the aircraft they were never going to buy
A perfect Sir Humpreyesque summation......
And IMHO, the most likely scenario that will occur.