With or without a definite article

I guess that of the following pairs, a) is more natural than b). Am I right?

1a) The study of economics is essential for understanding society as well as business.

1b) Study of economics is essential for understanding society as well as business.

2a) The study of economics is generally divided into two areas: microeconomics and macroeconomics.

2b) Study of economics is generally divided into two areas: microeconomics and macroeconomics.