Dehydration reactions _____. They do so by _____.

A link monomers to form a polymer ... adding a water molecule
B remove monomers from polymers ... adding a water molecule
C link monomers to form a polymer ... removing a water molecule
D remove monomers from polymers ... removing a water molecule

C) Link monomers to form a polymer. They do so by removing a water molecule.
Also, I think this answer might clarify: http://answers.yahoo.com/question/index?…

Sorry, you can figure this out pretty easy on your own, but a hint will help you narrow down the choices. "Hydration" means water. What do you think "Dehydration" means? That should narrow your choices to two answers. Good luck.