Which of following research conditions is most likely to employ an independent-measures design?
A) Evaluate the effectiveness of a diet program by measuring how much weight is lost during 4 weeks of dieting.
B) Evaluate the effectiveness of a cholesterol medication by comparing cholesterol levels before and after the medication.
C) Evaluate the difference in verbal skills between 3-year-old girls and 3-year-old boys.
D) Evaluate the development of verbal skills between age 2 and age 3 for a sample of girls.