Which is a run-on sentence?
a. keys are made for each lock, yet many keys look the same.
b. apples are generally red, but there are some golden varieties.
c. sailboats use wind power, but many sailboats also have a motor.
d. flamingos are usually pink one variety is bright red.

i think the correct answer would be adjustments in life roles.  this causes for one to adjust or change totally his/her career or lifestyle since the present is not beneficial to the life role he is at. for instance, you became a mother you would of course stop going to malls and enjoying life outside. you would be staying at home taking care of your child.