Roles are:

a) a prestige grading, position or rank within a group.
b) the adjustment of one’s behavior to align with group norms.
c) acceptable standards shared by a group’s members.
d) behavior patterns expected of someone who occupies a given position in a social unit.

Roles are behavior patterns expected of someone who occupies a given position in a social unit.

Explanation:

It is a behavior pattern. A role can be defined as a set of beliefs, behaviors, obligations, rights and norms correlated as convinced by people in a social situation. It is an expected or independent or constantly changing behavior and may have an individual social status. This is important for both functional and interactional understanding of society.

When a person holds certain position then people expects from that person to behave according to a certain pattern. But it is not true that a person behaves according to the certain norms because other factors such as mentality, nature of the person and mental state also plays an important role in managing ‘role’.  

a.. a conflict between her competing identities.. apex

manifest functions are the recognized and intended consequences of any social pattern, while latent functions are those unrecognized and unintended consequences. to analyze the manifest functions of any social institution, we have to study its contribution to the continuation of a group, community, or society.