earth elements (REEs) are a group of 17 metallic including the lanthanides, scandium, and known for their unique properties like luminescence, and conductivity. These are crucial components in various from consumer electronics to clean and medical devices. While relatively abundant the Earth's crust, they are often dispersed and to extract in concentrated quantities, hence the "rare earth". I is correct: Rare earth elements such as terbium, and yttrium are used in the of flat-screen TVs and computer monitors, in the color displays. II is correct and explains statement I: These earths have phosphorescent (or luminescent) which means they emit light when excited energy—this property is essential for producing vivid in display technologies. option (a) is the correct answer.