Idu ate a bowl of clam chowder that had gone bad and became ill with food poisoning. Now he finds that the smell of clam chowder makes him feel queasy. In this example, the unconditioned stimulus is: a. the rotten clam chowder Idu consumed b. the nausea Idu felt after eating the rotten clam chowder c. the smell of clam chowder d. the nausea that Idu feels when he smells clam chowder
