Which of these factors is the strongest sign that Country B has a developed economy?

Multinational corporations operate within its borders.

It is home to many high-tech companies.

It has laws favorable to entrepreneurship

It has a high gross domestic product

the answer is D

The answers are,

It has a high gross domestic product

Explanation:

Just because there are multinational companies in a country it doesn't mean the economy is developed. Most of the time, these companies are not owned by those states!

And high tech companies could exist in a country that is not developed too. It is only a one industry and does not reflect the entire economy.