The correct answer is option 'A': Protect refugees worldwide.

Explanation:

The United Nations Development Programme (UNDP) is the United Nations' global development network. It works in nearly 170 countries and territories, helping to eradicate poverty, reduce inequalities, and build resilience to achieve sustainable development. The UNDP focuses on several key areas, including poverty reduction, crisis prevention and recovery, energy and environment, and more. However, the protection of refugees worldwide is not one of its specific functions. Here is a detailed explanation of each function of the UNDP:

1. Poverty reduction:
- The UNDP works to eradicate poverty and reduce inequalities through various initiatives and programs.
- It supports countries in developing and implementing poverty reduction strategies.
- It promotes inclusive growth, social protection, and access to basic services for vulnerable populations.

2. Crisis prevention and recovery:
- The UNDP plays a crucial role in crisis prevention and recovery efforts globally.
- It assists countries in strengthening their resilience to crises, be it natural disasters, conflicts, or other emergencies.
- It helps in disaster risk reduction, post-disaster recovery, and peacebuilding initiatives.

3. Energy and environment:
- The UNDP promotes sustainable energy solutions and supports countries in their transition towards clean and renewable energy sources.
- It works to address climate change issues, promote environmental sustainability, and protect biodiversity.
- It assists countries in developing climate change adaptation and mitigation strategies.

4. Democratic governance:
- The UNDP supports countries in strengthening democratic governance and promoting the rule of law.
- It helps in building accountable institutions, promoting human rights, and enhancing citizen participation.
- It assists in electoral processes, constitutional reforms, and promoting gender equality and women's empowerment.

5. Sustainable development:
- The UNDP plays a vital role in advancing the sustainable development agenda.
- It supports countries in achieving the Sustainable Development Goals (SDGs) through integrated approaches.
- It promotes sustainable economic growth, social inclusion, and environmental sustainability.

In summary, while the UNDP focuses on various important functions such as poverty reduction, crisis prevention and recovery, energy and environment, and democratic governance, the specific function of protecting refugees worldwide falls under the mandate of other United Nations agencies, such as the United Nations High Commissioner for Refugees (UNHCR).