(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

http://imageshack.us/photo/my-images/15/unledflsq.png/

2. Relevant equations

A simply connected domain D in the complex plane is an open and path

connected set such that every simple closed path in D encloses only points of D.

3. The attempt at a solution

The answers are a,c and d.I don't understand why they all aren't simply connected. They are all path connected and open. Am I misunderstanding the definition of open?

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# Simply connected domains

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