Final answer:
In the Ted Talk 'Mental Health For All,' the 'R' in SUNDAR stands for 'Reality,' emphasizing the need to recognize and accept the real-world situation's as a part of mental health care.
Step-by-step explanation:
In the Ted Talk titled Mental Health For All, the "R" in SUNDAR stands for Reality. This concept focuses on the importance of acknowledging and addressing the sum total of all that is real, a foundational aspect of mental health. Reality in the context of the acronym SUNDAR refers to recognizing and accepting the world as it is, which is a pivotal step in ensuring mental health is accessible and effective for everyone.