C2 is the answer for this problem. White could connet with 2, attempting for the second eye, but black will play 3. Black of course can't play F3 since it's self-atari. In a real game white should just skip move 4 and save it as a ko threat.

White captured
Black can't play D2. White will lay C2 and the tesuji at E3 won't do anymore, since white will have 2 eyes.

E3 also won't work if it was played first. White will simply connect, leaving C2 and F3 as miai.

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