Book 'A brief history of time' is written by:

Stephen Hawking

The correct answer is Option (4) - Stephen Hawking

"A Brief History of Time" is a popular science book written by the renowned physicist Stephen Hawking. In this book, Hawking discusses complex scientific concepts such as cosmology, black holes, the nature of time, and the origins of the universe in a manner accessible to non-experts. It explores fundamental questions about the nature of reality and the universe, making it one of the most widely read books on physics and cosmology. Hawking's writing style is clear and engaging, making difficult concepts understandable to a general audience.