On his own time, D.J. looks over his course syllabi for the term and realizes that, in three weeks, he has three assignments due on one day. D.J. decides he will do one assignment per week for the next three weeks so that he will have them all done by their due dates. D.J. is demonstrating _____ thinking.
A. preoperational
B. concrete operational
C. formal operational
D. postformal