Answer:
The correct answer would be option A, The amount of arable land affects the agricultural output of a nation.
Step-by-step explanation:
Arable land is a land which is capable of producing crops. A land where soil can be ploughed and crops can be grown, is know as the Arable Land. When crops are grown in a country, they help the country to increase their agricultural output. So arable land affects the agricultural output of the country or nation. For example, if a land is arable, farmers grow crops like potatoes, carrots, tomatoes, cucumbers, etc, and help the country in boosting the agricultural area. This would contribute towards the increase in the gross domestic product of the country.