Olá!
The Women's Rights movement has had a significant impact on society and has brought about substantial changes. This indicates that social movements can be highly effective in creating change. Therefore, the answer would be:
B. They have become more effective with each new generation
This is because with each new generation, social movements like the Women's Rights movement have adapted and evolved their strategies, becoming more inclusive and intersectional, and using new platforms (like social media) for mobilization and advocacy.