**Core Concept**
The International Diabetes Association (IDA) is a global organization dedicated to diabetes care, research, and education. It plays a crucial role in promoting diabetes awareness, advocating for diabetes care, and providing resources for healthcare professionals and individuals affected by diabetes.

**Why the Correct Answer is Right**
The IDA was founded in 1950 by a group of healthcare professionals with the primary objective of promoting diabetes care and research worldwide. The organization has since grown to become a leading voice in the global diabetes community, providing educational resources, advocating for diabetes-friendly policies, and supporting research into the causes and treatment of diabetes. The IDA's efforts have helped to improve diabetes care and outcomes for millions of people around the world.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the IDA was not established in the 1970s. While the organization has undergone significant growth and development over the years, its founding dates back to the mid-20th century.

**Option B:** This option is incorrect because the IDA was not established in the United States. While the organization has a strong presence in the US and works closely with American diabetes organizations, it is a global organization with members and activities in many countries.

**Option C:** This option is incorrect because the IDA was not established in 1920. This date predates the organization's founding by several decades and is not supported by historical records.

**Clinical Pearl / High-Yield Fact**
The IDA's founding marked the beginning of a global effort to improve diabetes care and research. Today, the organization remains a leading voice in the diabetes community, providing critical resources and support for individuals and healthcare professionals around the world.

**Correct Answer:** C. 1950