The correct options are
A Imbalance in development.
B Feelings of superiority of one region over another.
C Feeling of being cheated.
There are states that have developed economically and achieve progress in areas like education, health, and culture. Those who have not, can develop inferority complex. Their opportunities are limited and they are plagued by problems. Therefore, they feel cheated. As a result, understanding between states get broken, leading to regionalism.