The correct matches are: A-3 (Mangdechhu Hydroelectric Project - Bhutan), B-2 (Restoration of Stor Palace - Afghanistan), C-4 (District Hospital at Dickoya - Sri Lanka), and D-1 (Institute of Security and Law Enforcement Studies - Maldives). This set illustrates India's strategic partnerships and developmental projects within South Asia, emphasizing India's role in fostering regional stability and cooperation. Such projects are often aimed at enhancing infrastructure, healthcare, and educational capacities in neighboring countries, thereby promoting goodwill and influence in the region, which is a vital component of India’s foreign policy as emphasized in UPSC syllabus, particularly in international relations and regional studies.