__ 19. A large oil reserve a. was discovered in Morocco in the year 2000 b. has not been discovered in the past decade. c. has only been discovered in Saudi Arabia. d. will probably be discovered on the moon.

The correct answer is a. was discovered in Morocco in the year 2000.<br /><br />Explanation:<br />- Option a states that a large oil reserve was discovered in Morocco in the year 2000. This is accurate as Morocco has discovered significant oil reserves in recent years.<br />- Option b is incorrect because oil reserves have been discovered in Morocco in the past decade.<br />- Option c is incorrect because oil reserves have been discovered in countries other than Saudi Arabia, including Morocco.<br />- Option d is incorrect because there is no evidence to suggest that oil reserves will be discovered on the moon.