The correct option is C Olfactory epithelium of out nose
Bowman's glands are situated in the olfactory mucosa beneath the olfactory epithelium, in the lamina propria which is a connective tissue also containing fibroblasts, blood vessels and bundles of fine axons from the olfactory neurons.
Thus, the correct answer is option (C), 'Olfactory epithelium of out nose'.