For what it is worth, given the incomplete information presented in the statement, I concur that the B-1 is the most likely option that Team A would choose, if they get the opportunity.
However, this is a situation in which Team B really needs to be aware of the possible outcomes. If they understand that they may decline offsetting fouls, but, in doing so, they face the prospect of getting the ball at the B-1, or they may electing offsetting fouls and repeat the kickoff, I have a feeling they will elect offsetting fouls and repeat the kickoff. They are far likelier to have a better result with another kickoff than simply taking the ball at the B-1. Of course, time and score can greatly affect their choice. But, one thing is for certain, if Team B declines offsetting fouls, Team A will decline B's penalty as well, and force Team B to take the ball at the B-1. And, once Team B elects to decline offsetting fouls, there is no going back - no way to change their choice.
That's why the R must take his time and explain the options and outcomes to Team B. Explain B's options to them (and, like Kalle, in this case, I wouldn't even bother with the B-8 as a possible outcome - that simply won't happen), with emphasis on electing offsetting fouls, and let them make the smart choice (offsetting fouls). This takes Team A out of the decision making process (which will be the case in the vast majority of "clean hands" scenarios). Although rare for Team A to decline B's penalty, this is a scenario in which their choice is obvious, and no need to consult with them.
The crew must also advise Team B with respect to remaining game time. For example, if the clock expired during the down, declining offsetting fouls will open the door for A to decline B's penalty, thus, ending the period/half/game. That could be a greater influence on Team B's decision than field position.
Unfortunately, the full set of options are not presented as answer choices. In fact, none of the given options are totally correct. On the assumption that time & score are not a major consideration for this statement, the best answer would have been, "B, 1/10, B-1, or A, K/O, A-35 (offsetting fouls). Or, "None of the above."