Here are the correct answers for the gaps in the text based on the context provided:

1. (3) **D. members**
2. (4) **B. volunteers**
3. (5) **D. leaders**

So the completed sentences would read:

"The International Federation of Red Cross and Red Crescent Societies (IFRC) is the world's largest network to help people in emergency. It supports local Red Cross and Red Crescent activities in more than 192 countries with over 160 (3) **members** who can reach even the remotest communities. It has about 14 million (2) **volunteers** worldwide. These volunteers are members of the very (3) **members** they serve. They know, and are trusted by, the people they support.

The IFRC acts before, during and after disasters or health emergencies to (4) **volunteers** the needs and improve the lives of vulnerable people. Every year, the IFRC reaches the people who are easily emotionally and physically hurt through programmes to promote development and disaster response. It also works to improve global humanitarian standards. In addition, it works to (5) **leaders** to act in the interests of vulnerable people. Through its work, the IFRC enables healthy and safe communities, reduces vulnerabilities, and promotes peace around the world."