Opinion Poll: What's the best Share icon

Which is the best share icon?

The one Dolphin uses, A:

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Or this one, B:

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Or perhaps this one, C:

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I Prefer B:

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I believe it's the most intuitive.

I guess "A" as it looks like it's crawling out to a network.

but to be honest neither of them scream share to me. 

 That's the problem.  Android users may be more familiar with A.  Apple users may be more familiar with B or C.  Someone that has never seen any of them, probably won't have a clue. Probably the only reason I think B is more intuitive, is because I've been seeing something similar on my iPhone for ten years.

There's always the bullhorn. It conveys shouting out to a crowd. It's just not very sexy.

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I think the two icons should serve two different purposes - the "A" one is probably good for sharing within the site (reposting) and B,C are more for "external" sharing, like posting to Facebook and Twitter. Perhaps B is best for that as it sort of shows the arrow jumping outside of the square/site. 

B is actually supposed to to be a letter tray, and the arrow is supposed to be something leaving it.  Sharethis has been using A for a long time. 

I'm just trying to decide which one to use on a template. I'm considering A, and switching to C on hover.

A