Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 41 to 45.

In the 1960’s, the US went through a social revolution commonly referred to as The Women’s Liberation Movement. One of the goals of this movement was to promote the idea that women are equal to men in their ability to learn and to succeed in almost any occupation. The movement has benefited women in many ways, especially in terms of job opportunity and advancement. But it has also created great confusion regarding manners. Formerly, men were considered the stronger and the dominant sex, so they adopt a protective attitude toward the so-called weaker sex. That meant helping women on and off with their coats, lighting their cigarettes, opening doors for them, allowing them to exit from elevators first, and so on. Today, American women do not consider themselves the weaker sex and do not generally feel in need of male protection. Most men continue to perform the traditional courtesies, but both sexes are more casual about them. If a man does not help his girlfriend into or out of her chair in a restaurant, no one will think he is rude.

The Women’s Liberation Movement is a ________.