A obviously.
Since you said attraction psychology question, mens brains are programmed to be more attracted to long, skinnier necks because of multiple reasons, but the main one being that it is more of a womans feature than a mans feature, so she looks "more like a woman" in picture A than picture B.
hope i didn't ruin your topic
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http://28.media.tumblr.com/tumblr_lcb35gGx0t1qailr4o1_500.gif
http://www.megavideo.com/?v=57N0YAEJ