Explanation:

- Option 1: Ulrich Beck

- Correct Answer: Ulrich Beck

- Ulrich Beck was a German sociologist and published "Risk Society: Towards a New Modernity" in 1992. The book discusses how modern society is dealing with risks associated with technological and scientific advancements.

- Your answer is right.

- Option 2: K.R. Popper

- Karl Popper was a philosopher known for his contributions to the philosophy of science, but he did not write "Risk Society."

- Option 3: Lyotard

- Jean-François Lyotard was a French philosopher known for his work on postmodernism, but "Risk Society" is not his work.

- Option 4: M. Castells

- Manuel Castells is a Spanish sociologist known for his research on the information society, but he did not write "Risk Society."