Solution

C: Chandrayaan-3 is India's third lunar exploration mission: This sentence introduces the topic of discussion, which is the Chandrayaan-3 mission. B: planned by the Indian Space Research Organisation (ISRO): Following the introduction of the mission, this sentence provides information about its planning and the organization behind it, which is ISRO. D: It aims to further explore the Moon's surface and potential resources after the previous Chandrayaan missions: This sentence explains the objective of Chandrayaan-3, which is to continue exploring the Moon's surface and its resources after previous missions. A: Chandrayaan-3 will focus on the soft landing of a lander and a rover: After introducing the mission and its objective, this sentence elaborates on the specific focus of Chandrayaan-3, which is achieving a soft landing of a lander and a rover on the Moon's surface. E: on the Moon's surface, following the challenges faced by Chandrayaan-2's Vikram lander: This sentence provides additional context by mentioning the challenges faced by Chandrayaan-2's Vikram lander and how Chandrayaan-3's soft landing focus follows from those challenges.