Which statement about the maxillary sinus is accurate?

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It drains into the inferior nasal meatus.The root of the first molar extends into its floor.It reaches full development by eight years of age.It drains efficiently when a person is standing upright.

Explanation

Option B is correct because the root of the first molar often protrudes into the floor of the maxillary sinus. Option A is incorrect since the maxillary sinus opens into the middle nasal meatus, not the inferior. Option C is false because the sinus continues to develop beyond eight years of age. Option D is incorrect because the drainage of the maxillary sinus is poor when upright due to the position of its opening.