Connection between countries of the world who have in recent history -remained the same
-increased
-decreased

Increased

Explanation:

Due to the innovation in both communication and transportation technology, it is very easy for a person to reach out to other people who live in another country.

As a result, connection between countries were increased rapidly.

For example, now it is easier for local companies to collaborate with foreign supplier to market their product in that foreign countries. Not only that, it is also very easy for people to reach out to a high government officials from another country by using social media.

answer; (d) melting of sea ice;