He study of four-year-olds and marshmallows found that some children ate one marshmallow right away ...

he study of four-year-olds and marshmallows found that some children ate one marshmallow right away (immediate gratification) while other children were able to wait until the experimenter returned and received a second marshmallow to eat (delayed gratification). Which of the following statements is true regarding these two groups of children as they reached adulthood?
 
  a.
  There were no apparent differences between the two groups.
  b.
  The group that delayed gratification had higher Scholastic Aptitude Test (SAT) scores.
  c.
  The group that delayed gratification had borne more children while unmarried.
  d.
  The group that delayed gratification had experienced more problems with the law.