30 Experts of birth-order theory claim that only children not only have many of the same characteristics as the oldest but often overdo them. (A) The experts claim that only children often perform better than the oldest. (B) According to the experts, only children often behave more like the oldest. (C) According to the experts, only children often do not get on with the oldest. (D) The experts claim that only children often act quite differently from the oldest.