In following problems you need to identify last remaining place, where points could be gained, or reduced. The gained points are marked in the correct answer. The lost reduction opportunities are marked in wrong variations.
In the end black cannot reduce white liberties to one, and the ladder fails. The result is bad for black. Blacks stones are weak, and no white stone is captured. White can expect to attack or capture some of the black stones.
If black tries to continue the attack, white can play as in diagram. This lets white to capture a stone from either of the marked positions next. White move could as well be in A or B.