Amelia and Rami Are Babysitting Amelia's Four-Year-Old Nephew, Nelson, and Her

Amelia and Rami are babysitting Amelia's four-year-old nephew, Nelson, and her three-year old niece, Penny. It has been nine months since Amelia and Rami last saw the kids, and they are shocked at how much they have developed in less than a year. To pass the time, they decide to do arts and crafts with the kids, and then head out to play outside after a snack.
-Amelia recently read a developmental psychology paper about personality with a longitudinal research design,whereas Rami read one that used a cross-sectional research design.Which of the following is most likely

A) Amelia will mention that Penny's easy-going personality is similar to the majority of other kids her age.
B) Rami will mention that Penny's easy-going personality is likely to last her entire life.
C) Rami will mention that Nelson's slow to warm-up personality is similar to the majority of other kids his age.
D) Amelia will mention that Nelson's slow to warm-up personality is likely to last his entire life.