The difference between the vestibular folds and the vocal folds in the larynx is that the vestibular folds .

Play no part in sound production.

Explanation:

Larynx is the important organs that are involved in the sound production and in the respiratory system as well. The larynx is also helpful in the relaxation of the cough.

The vestibular fold is also known as the false vocal cord that lies superiorly to the vocal folds. Their main function is to protect the larynx whereas the vestibular folds play an important role in the production of sound. The vestibular folds do not play role in the process of sound production.

Thus, the answer is play no part in sound production.

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c. earths continental crust is thicker than its lithosphere.

because, the lithosphere is the outermost layer of the earth/ 100 km thick and is defined by its machanical properties.the lithosphere contains oceanic and continental crust that varies in age and thickness across locations and geologic time. the lithosphere is the coolest layer of the earth in terms of temperature. the term lithosphere should not be confused with the use of "geosphere" which is used to indicate all of earth systems, including the atmosphere, hydrosphere   and biosphere. the surface of the earth can be divided into the continental crust and the oceanic crust.   the continental crust is made mostly of granite while the oceanic crust is made of basalt. the average thickness of the continental crust is 25 miles and the average thickness of the oceanic crust is 5 miles.   three types of rock, igneous, sedimentary, and metamorphic, make up the surface of the earth. that's why 3 option is preferable.