[Q] runtime option not showing up in developer options topic

Running latest lolipop 5.0 on my lg g3 and trying to switch from dalvik to art runtime however for some reason this option is not showing up on my device. Any advice on why I can't see it or how to get it to 'appear' lol would be much appreciated from a new owner.

Dalvik Runtime for N9005 lollipop topic

HI any 1 know how to switch the RUntime from Art to dalvik in Android 5.0 lollipop for N9005?

[Q] ART Runtime on SM-G355H? topic

is there a way to enable ART on Galaxy Core 2 Duos' Stock ROM? Any Guides please?

BTW, libart.so and libart-compiler.so are missing in the /lib folder.