Solution 1 Capping the weak White one point center skip with B1 is the most forcing way to play here, but certainly not the only conceivable one!
One plausible alternative is to begin with the jump to B“a” to strengthen Black’s corner below while threatening to enclose the White stones. But that will almost certainly induce the response of W1, to which B“c” will then be an essentially forced reply, leaving White with Sente.
It’s also not inconceivable to play elsewhere, especially the right side, but B1 gives Black control of at least the next few moves of the game, and therefore on balance will be the most satisfying to an aggressive player.