Which among the following was NOT written by Thomas Carlyle?

The correct answer is The Stones of Venice.

To understand why this is the correct option, let us examine the authorship of each work listed:
1. ‘Signs of the Times’: This is a well-known essay written by the Scottish essayist and historian Thomas Carlyle in 1829. In this essay, Carlyle critiqued the industrialization of society, calling it the "Mechanical Age."
2. Sartor Resartus: First published as a single volume in 1836, this is one of Thomas Carlyle's most famous and influential works. It is a philosophical novel that explores the "philosophy of clothes" to critique contemporary thought and society.
3. The Stones of Venice: This is a three-volume treatise on Venetian art and architecture written by the prominent Victorian art critic John Ruskin, published between 1851 and 1853. Since this work was written by John Ruskin and not Thomas Carlyle, it is the correct answer.
4. The Life of John Sterling: Published in 1851, this is a biography written by Thomas Carlyle about his close friend and writer John Sterling.

Therefore, among the given choices, The Stones of Venice is the work that was NOT written by Thomas Carlyle.