The correct answer is (a) Bhavya Lal.
Bhavya Lal is an Indian-American astrophysicist and policy expert who has been appointed as acting Chief of Staff of NASA. She is the first woman and first person of Indian descent to hold this position.
Lal is a graduate of the University of Pennsylvania and the University of California, Berkeley. She has worked as a scientist at NASA’s Jet Propulsion Laboratory and as a policy analyst at the White House Office of Science and Technology Policy.
In her new role, Lal will be responsible for overseeing NASA’s day-to-day operations and providing strategic advice to the agency’s administrator. She is a highly respected scientist and policy expert who is well-positioned to lead NASA into the next era of space exploration.
Option (b), Raja Chari, is an Indian-American astronaut who is currently serving as a flight engineer on the International Space Station. He is not the Indian-American who has been appointed as acting Chief of Staff of NASA.
Option (c), Vivek Murthy, is an Indian-American physician and public health leader who served as the 21st Surgeon General of the United States from 2014 to 2017. He is not the Indian-American who has been appointed as acting Chief of Staff of NASA.
Option (d), Raj Ayar, is an Indian-American engineer and entrepreneur who is the co-founder and CEO of the company Ayar Labs. He is not the Indian-American who has been appointed as acting Chief of Staff of NASA.