Which of the Following Markets Has Proven to Generally Not

Which of the following markets has proven to generally not be very stable in terms of needs and demographic and psychological factors?

A) The teenage market due to their quick adoption, and subsequent quick desertion of fads and trends.
B) Young adult females due to their tendency to be indecisive.
C) Middle-aged males because they are generally not the decision makers of purchases in their household.
D) Young parents due to their preference for convenient product offerings.