I am testing it on Google Chrome 32.0.1700.76 m
The last option in the select tag is not getting the hover effect from mouse.
It is highlighting when using through keyboard.
It is Bug . Issue 336348:Last option of select does not get highlighted on mouse hover
and also see Issue 334227:[Aura] Regression : Last dropdown item not highlighted on mouse-hover
It's not the problem with your code it's due to Google Chrome Bug.
With more than 3 options this bug comes into play.
This issue has been fixed in Google Chrome latest Version 32.0.1700.102 m
.
Solution Update your Google Chrome to latest Version.
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