Which of the Following Children Is MOST Likely to Have

Which of the following children is MOST likely to have older siblings?

A) Joe, who is very popular with his peers and who is very innovative.
B) Steve, who conforms easily to his parents' and other adults' requests.
C) Martin, who has known from his middle-school years that he is "destined" to go to college.
D) Herb, who earned a very high score on a recent administration of an intelligence test.