The correct answer is Adam Smith.
Adam Smith is considered the father of modern economics. He was a Scottish economist and philosopher who lived from 1723 to 1790. His most famous work is The Wealth of Nations, which was published in 1776. In this book, Smith argued that the free market is the best way to organize an economy. He also developed the theory of comparative advantage, which explains why countries trade with each other.
Max Muller was a German-born British philologist and orientalist who lived from 1823 to 1900. He is best known for his work on comparative linguistics and the study of Sanskrit. He is not considered to be an economist.
Karl Marx was a German philosopher, economist, historian, sociologist, political theorist, journalist and socialist revolutionary. He was born in Trier, Germany, in 1818 and died in London in 1883. Marx is best known for his work on political economy and social theory. He is considered to be one of the most influential thinkers in history. However, he is not considered to be the father of economics.
Therefore, the correct answer is Adam Smith.