💡 Detailed Explanation
The noun 'りゆう' (reason) is written in kanji as '理由' (riyū). Sentence translation: 'Please tell me the reason why you were late.' '由' (yū/yoshi) means cause/reason, whereas '油' (abura/yu) means oil. '里' (ri/sato) means village or hometown. The other combinations are orthographical traps.