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Stomata are groups of two or more specialized epidermic cells whose function is to regulate gas exchange and respiration. They are located in the green air parts of the plant, in one or two epidermis
Great response, LiliaKarina. I just want to add a few more pieces of info that might help you get your answer.
Stomata are found in both leaves and stems.
Stomata are not found in your hepatophytes, or liverworts (marchiantophyta on wikipedia). The thing to keep in mind is they are only a tiny representation of all plant species - so you can pretty safely assume that most of the plants you encounter DO have stomata. My point here is - you don't really have to worry about the esoteric organisms that they throw at you, as long as you understand the general patterns of plant morphology.
i think in small proportions they can be found also in the stem of certain plants, but of course mainly on the outer surface of the leaf and in less quantity on the inside surface of the leaf.
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^Yes good point Phascolarctos. I just looked it up now to confirm....Psilotum, despite their very simple structures, still do possess stomata on their stems. Likewise with equisetum. Can't comment on the rest of the choices, though I'm leaning towards number 2 as well. Either way, the answer does appear to be number 5.