27-year-old man comes to his doctor complaining that the floor of his mouth is painful and swollen. Bimanual palpation and later computed tomography show an 8-mm stone (sialolith) in the right submandibular salivary duct, as indicated by the arrow in the figure. If the submandibular duct is partially obstructed, where would the physician observe salivation in the oral cavity after applying pressure to the right submandibular gland? 

• (A)  Oralvestibule
• (B)  Palatine mucosa
• (C)  Sublingual fold 
• (D)  Lingual Frenulum

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