Answer:
Correct answer is d. it made it clear to other European countries that they needed to expand their own colonies and exploration.
Explanation:
According to this treaty Spain and Portugal decided to divide their domain in colonies, which established them as the greatest colonial forces. Their spreading of power affected other European powers, such as England, France and Netherlands. Those countries decided to create colonies on their own, and started establishing them especially in North America.
That is why option D is the only correct answer.