Answer: The correct answer for the fill in the blank is A) Physical.
Maturation refers to growth like, goal oriented, and adaptive changes in the organism throughout their life. As growth is related to physical development of the individuals, therefore maturation corresponds to physical development.
Emotional development is concerned with regulation of feelings or emotions at different situations that is how an individual manages feelings. Cognitive development is related with mental development ( like thinking, analyzing) and social development means ability of getting socialized ( that is interacting with others).
Thus, A) is the right answer for the blank.