Correct Answer: (B) Asia and Africa had nationalist movements, which ended colonialism.

Step 1 - What the passage says:

It shows that rights we take for granted today, such as the weekly holiday, the eight-hour working day, equal pay and social security, were all won through collective struggle.

Step 2 - Apply the same idea:

Nationalist movements across Asia and Africa brought colonial rule to an end. This is a clear example of social movements reshaping the world.

Step 3 - Why the others are wrong:

The nineteenth century reform movements did influence caste and gender relations, the Civil Rights Movement in the USA did win equal rights for African-Americans, and the anti-apartheid struggle did transform South African society. All three options state the opposite of the truth.

Hence, option (B) is correct.