A few years ago a young mother watched her husband diaper（给...换尿布) their firstborn son

A few years ago a young mother watched her husband diaper(给...换尿布) their firstborn son. "You don't have to be so unhappy about it," she protested. "You can talk to him and smile a little." The father, who happened to be a psychologist, answered firmly, "He has nothing to say to me, and I have nothing to say to him."

Psychologists now know how wrong that father was. From the moment of birth, a baby has a great deal to say to his parents and they to him. But a decade or so ago, these experts were describing the newborn as a primitive creature who reacted only by reflex, a helpless victim of its environment without capacity to influence it. And mothers accepted the truth. Most thought(and some still do) that a new infant could see only blurry shadows, that his other senses were undeveloped, and that all he required was nourishment, clean diapers, and a warm bassinet.

Today university laboratories across the country are studying newborns in their first month of life. As a result, psychologists now describe the new baby as perceptive, with remarkable learning abilities and an even more remarkable capacity to shape his or her environment—including the attitudes and actions of his parents. Some researchers believe that the neonatal period may even be the most significant four weeks in an entire lifetime.

Far from being helpless, the newborn knows what he likes and rejects what he doesn't. He shuts out unpleasant sensations by closing his eyes or averting his face. He is a glutton for novelty. He prefers animate things over inanimate and likes people more than anything.

When a mere nine minutes old, an infant prefers a human face to a head-shaped outline. He makes the choice despite the fact that, with delivery-room attendants masked and gowned, he has never seen a human face before. By the time he's twelve hours old, his entire body moves in precise synchrony to the sound of a human voice, as if he were dancing. A non-human sound, such as a tapping noise, brings no such response.

The author points out that the father diapering his firstborn son was wrong because ______.

A．he thought the baby didn't have the power of speech

B．he believed the baby was not able to hear him

C．he was a psychologist unworthy of his profession

D．he thought the baby was not capable of any response