France joined the Triple Entente because it had a long history of friendship with Great Britain.
it needed protection from Germany.
its leaders wanted to take over land in the Balkans.
its leaders wanted to protect French colonies in Africa.

The reason why France joined the Triple Entente was because:

According to the given question, we are asked to show the major reason why France joined the Triple Entente and what they hoped to achieve.

As a result of this, we can see that France and Britain had a common enemy in Germany and they were allies so they had to join forces in order to attack Germany because Germany was much stronger.

Therefore, the correct answer is option B

Read more about the Triple Entente here:

link

Correct answer is it needed protection from Germany.

Explanation:

First option is wrong, France and Britain signed an alliance because they had common threat and enemy in Germany, and not because they had good relations.

Second option is correct because after the creation of German Empire in 1871 France was feeling the German threat, especially after they took some territories away from them.

Third option is not correct as France didn't had focus on Balkan that much, as for example Austria-Hungary and Russia did.

Fourth option is not correct as the quarrels in Africa about possessions started in the first decade of 20th Century.

because mexico wanted to choose a centralized location

it's lower nubia : ) good luck