During swallowing of food which structure closes the nasal opening?

Explanation

Option [A] hard palate plays a significant role as it separates the oral cavity from the nasal cavity and aiding swallowing and speaking.Option [B] The backward movement of the tongue pushes the soft palate up and closes the nasal opening at the back.So option [B] is right.Option [c] epiglottis ;The epiglottis is a flap of cartilage which is forced by the tonge[during swallowing] into more or less horizontal position thus closing the opening of the windpipe[the glottis].Option[D] larynx is the cartilage round the top of the windpipe which moves upward under the back of the tongue during swallowing