A portion of a research report says, "Gifted children—those under 14 and with an IQ over 130—are more likely to be popular than less-gifted children. Furthermore, their popularity is related to stronger social skills, and this ability is evident with adults as well as with children.". What portion of the statement illustrates an operational definition?a. Gifted children are under 14 and score more than 130 on IQ tests. b. Gifted children are more likely to be popular. c. Gifted children's popularity is due to stronger social skills. d. Gifted children's social skills are evident with adults as well as with children.