Read this summary of Passage 1.

(1) Where a person fits within the family birth order probably determines that person's character traits.
(2) Birth order theory focuses on patterns.

Which sentence belongs in the summary between sentences 1 and 2?

A) Data exists to support birth order theory.
B) Parenting styles are more important than birth order.
C) Little information exists about characteristics of only children.
D) Most successful people support birth order theory.​