What Did Richard Axel and Linda Buck Discover About the Way

What did Richard Axel and Linda Buck discover about the way in which we are able to perceive many different types of odors?

A) Many different types of odors bind to just a few different types of receptor molecules.
B) Vertebrate animals make a large number of distinct types of receptor proteins,each of which binds a particular odorant molecule or small group of such molecules.
C) Odors are distinguished by the way in which they bind both olfactory and taste receptors-it is the overall "picture" generated this way that we perceive.
D) None of these choices are correct.