Connor and Mandy Are Two Unrelated 13-Month-Old Infants

question 598

Multiple Choice

Connor and Mandy are two unrelated 13-month-old infants. Connor can already walk easily, but Mandy has yet to take her first steps. What is the most likely explanation for the difference between their ability levels?

• A) Connor is brighter than Mandy, since he is progressing through the stages of development more rapidly.
• B) Mandy and Connor are both well within the normal age range for the development of these motor skills.
• C) Connor's mother has taught him to walk, but Mandy's mother has not taught her to walk.
• D) Mandy's inability to walk at 13 months is abnormal and may indicate the presence of other developmental problems.