According to Adler's idea involving the order of birth, in which of the following ways is the first-born likely to react to the dethronement caused by the arrival of the second-born?
a) Feelings of resentment and jealousy toward the second-born.
b) Feelings of indifference and acceptance toward the second-born.
c) Feelings of excitement and curiosity toward the second-born.
d) Feelings of superiority and protectiveness toward the second-born.