I'd definitely go for the third one! And the main reason is you can never go wrong with an lbd! This one e simple and casual, but at the same time elegant and chic, therefore, the perfect combo for a good dinner date! The shoes are perfect for the occasion as well, not to high, with a classy shape and a little shade of color, popping out the gold details on the accessories. For me, that's all you could ask for a diner date, as it is supposed to be a cozy kind of date, not to reveling, with just the right amount of sexiness, and that you get with a slim fit figure ending on a turtle neck.
Now the reasons why the others are not appropriate, the first one, is just too aggressive. I'm personally not a big fan of the Kardashians, and this look is too party girl, too girls night out, for a dinner date. The cleavage is a bit to much, and there's too much going on in it, that would turn all the attentions to it which is not the purpose on a dinner date. The sandals are also a no no, it just goes with the flow of party animal, therefore, inappropriate.
The second look isn't as inappropriate as the first, but still not as good as the third. The cleavage is well hidden and the long sleeves are a bonus, but the overall look doesn't win as date material, it's more like party material. Personally I don't like the blue shoes for the idea of a date, it looks more like she's a blogger on her way for a fashion show.
In conclusion, when you want a look for more intimate dates such as dinners, go for a planner look, black is always a good choice, here, less is more!