I'm not sure that 'B' entirely fits coming on Answerbank. I think for most people here the answer is 'A' plus 'with a little help from my friends'.
Many years ago, four of us enjoyed pleasurable lunchtimes in a pub in Leicester solving the Times cryptic over a pie and a pint. (OK, four pints). It was a wonderful hour of convivial banter during which we put the world to rights and (usually) solved the puzzle.
We were younger then and the world was a much more relaxed, tolerant place. I used to do the Grauniad puzzle on my way into work on the train, and sometimes continue it in the office. When the time came to apply for another job, my boss wrote "If he could be encouraged to devote the time and effort he does to the Guardian crossword to the work he's paid to do, he'd be truly outstanding" as part of my reference.
The chair of the interview panel was a fellow crossword devotee, and I got the job.
Solving can be fun as a solitary or group pastime - as can most things, I believe! ;)