Which of the following research situations would be most likely to use an independent measures design?

Examine the development of vocabulary as a group of children mature from age 2 to age 3

Examine the long-term effectiveness of a stop-smoking treatment by interviewing subjects 2 and 6 months after treatment ends

Compare the mathematics skills for 9th grade boys vs versus 9th grade girls

Compare the blood-pressure readings before medication and after medication for a group of patients with high blood pressure.