Epithelial tissue is one of the four major tissue types in the body, acting as an interface between the body and the rest of the world.
I agree: a capped soda bottle has very limited contact with the surroundings, as it has to be relatively closed so that the gas bubbles don't escape.
The remaining options have contact either with air (A and D) or with water from the outside (B)
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I manage to check the attachment from other sources. The one that should indicates an enhancer region is <span>This is an enhancer region.</span>