A company selling child-care products ran a television ad depicting women as being primarily responsible for childcare. Many women viewers considered this regressive, alleging that the ad failed to recognize the much more diversified role of women in today's world. This is an example of:

stereotyping    

Explanation:

In social psychology, the term "stereotype" is referred to as a process that consists of an individual's over-generalized belief" related to a specific category of different individuals. The stereotype is considered as an exception that one person can have towards another person who belongs to a specific community or group. Therefore, the expectation can vary in terms of preferences, personality, capability, etc.

Stereotyping: The process of having a stereotypical behavior or personality towards the other person.

In the question above, the given statement is an example of stereotyping.