Economists focus on the marginal analysis of financial decisions and how we make them. In this context, what does the word marginal mean? A. costly B. additional C. important D. low-risk

The answer is B.) additional

This is the answer. In the picture it says the correct answer.

early settlements on the subcontinent. both the indus and the ganges rivers carried rich silt from the mountains to the plains. when the rivers flooded, the silt spread over the plains and made the soil in the river valleys fertile for farming.