Option 1 -> Adam Smith gave the classical wealth definition of economics.
Option 2 -> Marshall defined economics as the science of material welfare.
Option 3 -> Robbins defined economics as the science of scarcity and choice.
Option 4 -> Samuelson gave the modern growth-oriented definition.
Hence, Option 1: Adam Smith -> Adam Smith, known as the Father of Economics, gave the classical definition stating "Economics is the science of wealth." In his book 'The Wealth of Nations' (1776), he emphasized that economics deals with the creation, accumulation, and distribution of wealth. This wealth-centric approach dominated economic thought until the late 19th century when Marshall shifted focus to welfare and Robbins later emphasized scarcity and choice. -> correct