Advertisers will be most benefitted from which of the following group of people?

all of the above.

The advertisers aims at changing the attitude of the target population so that they can buy the advertised products. People having more open and flexible personality, change more easily.  People with strong prejudices are less prone to any attitude change than those who do not hold strong prejudices. Persons who have a low self-esteem, and do not have sufficient confidence in themselves, change their attitudes more easily than those who are high on selfesteem. Thus, all the three group of people can be changed easily and hence advertisers would benefit from them the most.