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It all depends on the configuration of the crossover and the terminals on your passive sub. The "crossover" inthe sub box may be just a low pass filter with the speaker lugs tied together, in which case options a and b amount to the same thing. If the "speaker out" lugs on the sub lead from a high pass filter in the sub box, then the trade off for option B is as follows:
Mains less burdoned by deep bass (good)
Load the amp sees is not halved (good)
Mains signal must pass through the sub's passive crossover components (probably cheap coils and caps) (bad)
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