:
There is no other option for Black than to start at the bottom.

:
Black has got four ko-threats.

A Black stone at (six liberties for White) would not have any effect, neither an additional one at (five liberties for White).

:
Threatening to capture White's three stones in the lower left corner is no valid ko-threat.

:
In the problem, White would connect the ko, instead.

:
White secures her first eye with this atari.

:
White has got two eyes, and is alive.