About the main focus of the current health sector policy of Ethiopia.

The question asks about the main focus of the current health sector policy of Ethiopia.

• Option A: Developing the prevailing components of health care. This option is too general. While developing components is part of any policy, it doesn't specify the main focus.
• Option B: Promoting curative health care services for every services for every body. Ethiopia's health policy, like many developing nations, places a strong emphasis on preventive and primary healthcare, rather than primarily on curative services, to address widespread health issues efficiently. This option contradicts that known emphasis.
• Option C: Facilitating the participation of public organization in health care. Ethiopia's health policy, particularly through its Health Extension Program (HEP), heavily relies on community participation and engagement of various public organizations (including community-level structures and local associations) to deliver health services, promote health, and implement preventive measures. This aligns well with the policy's focus on community-based primary healthcare.
• Option D: Expanding the population of public organization. This option is awkwardly phrased and less precise than option C. It's more about the participation and role of organizations rather than just their "population."

Given the strong emphasis on community-based healthcare and the Health Extension Program in Ethiopia, facilitating the participation of public organizations (which includes community groups and local structures) in health care is a core and main focus of the policy.

The final answer is $\text{C}$