Final answer:
The CEO referred to, based on their advocacy for racial justice and public statements on the murders of Breonna Taylor, Ahmaud Arbery, and George Floyd, is likely Kenneth Frazier, the CEO of Merck & Co., Inc.
Step-by-step explanation:
The CEO being referred to in this question is likely Kenneth Frazier, the chairman and CEO of Merck & Co., Inc. Frazier has been known to speak out on social justice issues and has taken a public stance against racial injustice in the wake of the murders of Breonna Taylor, Ahmaud Arbery, and George Floyd. While the question does not specify the date of the tweet, Kenneth Frazier has been vocal in this space, aligning with the actions described in the question.
It's important to note that serving as a CEO while advocating for racial justice draws significant public attention. CEOs from various companies have used their platforms to address these systemic issues, reflecting broader trends in corporate social responsibility and the role of business leaders in societal issues.