In general, gender roles:

a. are more pronounced for couples when both partners are working.
b. are more differentiated during adolescence than they are among newlyweds.
c. tend to remain constant across the adult years.
d. become more traditional and differentiated in a married couple following the birth of a child.

In general, gender roles: Become more traditional and differentiated in the married couple following the birth of the child.

Explanation:

After the birth of the child, both wife and husband follow the path of tradition and custom. They feel that they have to follow the path of morals, so that their activities become the guiding light for the child to tread in the path of ethics and morals inn daily life.

They feel responsible after the birth of the child and this enables the couple to work harder for the quality life of the child. They also feel that they are the ambassadors of the age old culture and tradition and they infuse certain customs and belief in the minds of their children.  

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answer; /// i believe the correct answer is (b) disposition