Which of the Following Is an Example of an Unconditioned

Which of the following is an example of an unconditioned response?

A) a person jumps at a loud noise
B) a dog drools when hearing a bell that is usually rung before food is presented
C) a child fears white animals after being exposed to a loud noise paired with a white mouse
D) a person feels hunger at the sight of red and yellow stripes similar to those on food wrappers