"Detrimental" means causing harm or damage, so its antonym would be "Harmless," which indicates something that does not cause harm or injury. Therefore, option (B) Harmless is the most suitable antonym in this context.

"Jaded" describes a state of weariness, fatigue, or lack of enthusiasm. The opposite of this would be feeling "refreshed," indicating a renewed and invigorated state. Therefore, option (B) refreshed is the most appropriate antonym in this context.

"Conceit" refers to an excessive sense of self-importance or pride, often accompanied by an overestimation of one's abilities. The antonym, "Modesty," represents a quality of being humble, unassuming, and free from excessive pride or self-assertion. Therefore, option (C) Modesty is the opposite or antonym of "Conceit."