Oral Rehydration Solutions That Contain Both Salt and Glucose Are

Oral rehydration solutions that contain both salt and glucose are highly effective in treating severe dehydration caused by diarrhea and vomiting. However, glucose or salt alone are not effective. This is because water passively follows

A) sodium and glucose, which are cotransported across the gastrointestinal epithelium.
B) glucose and sodium, which are transported by facilitated diffusion.
C) glucose, which provides the energy for the active transport of salt.
D) ATP, which is required to transport sodium unless glucose is available for cotransport.
E) glucose that is broken down quickly in the mouth by saliva and cotransported with salt via diffusion across the epithelial cells of the oral cavity.