Paul Klaczynski's Studies of Younger and Older Adolescents' Analytical Thinking

Paul Klaczynski's studies of younger and older adolescents' analytical thinking indicated that:

A) younger adolescents were rarely logical,whereas older adolescents were nearly always logical.
B) individuals who were analytical on some problems were analytical on all problems.
C) as adolescents grow older sometimes there is a gain in logic and other times there is regression.
D) younger adolescents tended to dismiss research that was contrary to their own beliefs.