The correct option is
D P-(iii), Q-(iv), R-(i), S-(ii)
- Adam Smith was a Scottish economist who proposed economics as the science of wealth and focused on wealth creation.
- Alfred Marshall was a British economist who suggested that economics is the study of human and social welfare.
Lionel Robbins was a British economist who established the relationship between scarce resources, having alternative uses and unlimited human wants, requiring allocation of resources optimally. - Paul A Samuelson was an American economist who focused on the growth of the nation through efficiency in the satisfaction of wants through the use of scarce resources.