Step 1: Understanding the Concept:
The question asks to identify the author of the seminal work in economics, "The Wealth of Nations".
Step 2: Detailed Explanation:
The book, fully titled "An Inquiry into the Nature and Causes of the Wealth of Nations," was written by the Scottish economist and philosopher Adam Smith.
It was published in 1776 and is considered a foundational text in classical economics. The book discusses concepts like the division of labor, productivity, and free markets. Adam Smith is often referred to as the "Father of Modern Economics".
Step 3: Final Answer:
The author of "Wealth of Nations" is Adam Smith. Therefore, option (A) is the correct answer.