If a little boy can hear his mother moving around in the kitchen downstairs in the morning, he can be fairly certain that it is time to get up and have his breakfast. the discriminative stimulus in this example is the: a) breakfast
b) the sounds of the mother moving around
c) the little boy
d) the kitchen

B) the sounds of the mother moving around

Explanation:

Discriminative stimulus: In psychology, the term discriminative stimulus refers to an antecedent stimulus that possesses stimulus control over a particular behaviour because that behaviour was reinforced in the presence of that specific stimulus in past.

In other words, the discriminative stimulus is referred to as a stimulus in whose presence a particular response is being reinforced.

In the question above, the discriminative stimulus is the sounds of the mother moving around.

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.