One ongoing challenge for these movements is:

The correct answer is: All of the above.

One ongoing challenge for social movements is addressing the intersectionality of caste, class, and gender. This means that social movements need to be aware of the ways in which different forms of oppression can overlap and compound each other, and they need to develop strategies that address all of these forms of oppression.

Another ongoing challenge for social movements is building alliances across different groups. This can be difficult, as different groups often have different interests and priorities. However, it is essential for social movements to build alliances if they want to be successful.

Finally, social movements also need to adapt to changing economic conditions. This can be difficult, as economic conditions are constantly changing. However, it is essential for social movements to be able to adapt if they want to continue to be effective.

Here is a brief explanation of each option:

• Addressing intersectionality of caste, class, and gender: Social movements need to be aware of the ways in which different forms of oppression can overlap and compound each other. For example, a woman from a low-caste background may experience discrimination based on both her caste and her gender. Social movements need to develop strategies that address all of these forms of oppression if they want to be successful.
• Building alliances across different groups: Different groups often have different interests and priorities. However, it is essential for social movements to build alliances if they want to be successful. This can be difficult, but it is important to remember that all social movements are fighting for a better world. By working together, social movements can achieve more than they could on their own.
• Adapting to changing economic conditions: Economic conditions are constantly changing. This can make it difficult for social movements to stay on track. However, it is essential for social movements to be able to adapt if they want to continue to be effective. This means being able to change their strategies and tactics as needed.

I hope this helps!