Gerald was diagnosed with adhd at an early age. throughout school he had extreme academic difficulties, though he excelled at art. when he graduated from high school he started a career as an artist and quickly began to sell his work and achieved critical acclaim. as an adult he was experiencing life success even though he still had symptoms of adhd. which of the four general principles of developmental psychopathology does this example best illustrate?

It illustrates the third principle of Developmental Psychopathology which is, "Life may be better or worse in adulthood".
There are children who suffers from serious disabilities that becomes more disabling when they get older. However, there are some who become happy and productive when they reach adulthood.  Just like Gerald, who happens to have attention deficit hyperactivity disorder (ADHD), he has difficulties in learning when he is younger. But he focused on his strength which is  arts. This lead him to be a successful artist as an adult.