What percentage of the US population was White as of 2015?

The correct choice reflects the demographic landscape of the United States as of 2015, where approximately 77.4% of the population identified as White. This percentage is significant in understanding the diversity and cultural composition of the U.S. population at that time, as it highlights one of the majority racial and ethnic groups while also setting a context for discussions about multiculturalism, representation, and healthcare practices that may need to address the needs of various populations.

While other options suggest different percentages, they do not accurately depict the demographic data recorded by the U.S. Census Bureau for that year. Recognizing the specific percentage helps in analyzing various aspects of societal structures, including healthcare delivery, resource allocation, and culturally competent care that acknowledges and respects the diversity within the population.