Directions: In each of the following questions, a

Solution

India's ambitious (A) solar mission: "Ambitious" is an adjective modifying the noun "mission," providing more information about the nature of the mission. This is grammatically correct and adds descriptive detail. Designed (C) to study the Sun's outermost layer: "Designed" is a verb that functions as a past participle here, indicating the purpose or intention behind the solar mission. It correctly describes the mission's purpose. And aiming (B) to enhance our understanding: "Aiming" is a gerund here, functioning as a present participle, indicating the ongoing action of the mission. It fits grammatically and logically, describing the objective of the mission.