The correct answer is: B. Richard Stallman.
Richard Stallman is an American software developer, free software activist, and the founder of the Free Software Foundation (FSF). He is the principal author of the GNU operating system, the GNU Compiler Collection (GCC), and the GNU Emacs text editor, and he has written numerous influential essays on software freedom.
Linus Torvalds is a Finnish-American software engineer who is best known as the creator of the Linux kernel, the operating system kernel for Linux and many other Unix-like operating systems. He is also the creator of Git, a distributed version control system.
Bob Young is an American entrepreneur and businessman. He is the co-founder and former CEO of Red Hat, a software company that develops and sells open source software.
A. Linus Torvalds is not the founder of the FSF. He is the creator of the Linux kernel, but he is not a member of the FSF and does not support its goals.
C. Bob Young is not the founder of the FSF. He is the co-founder and former CEO of Red Hat, but he is not a member of the FSF and does not support its goals.
D. All of the above is not the correct answer. Only Richard Stallman is the founder of the FSF.