Sarah Is Seven Months Old

Sarah is seven months old.Her parents spend three hours a day for five weeks straight holding Sarah up next to furniture in hopes that she will grab onto the furniture and stand by herself.Sarah hates this treatment and screams and cries, but her parents are unyielding.Finally, at the end of the fifth week, Sarah stands up by herself while holding onto the furniture.Her parents smile triumphantly.What have they accomplished here?

A) Sarah's parents have trained Sarah to stand up by herself earlier than the average.
B) Sarah was ready to stand up by herself at about eight months of age; but her parents simply put her through a training ordeal for nothing.
C) If Sarah's parents had not trained her, Sarah could have been developmentally delayed.
D) Sarah's parents have respected her personal rate of growth by encouraging her with psychomotor training.