C. Michael is playing a video game. An implicit detail is something you can infer. We can infer this because of the context clues like “his fingers working the controller furiously.” We can also check our other answers. For example, answer A says “The grass of the front lawn is long” This is stated in the passage so we know it’s not implicit detail. Answer B says “Michael’s room his higher than the kitchen.” It is stated that “Kristy heads up to Michael’s room.” Which means stairs so it’s obviously higher and it states it. Lastly, Answer D said “Kristy is waiting for Michael to notice her” It states right in the passage, “She waited for him to notice he was there.” There’s the full explanation. Hope it helped! :D