The correct option is 2 only because opening a new canal across the Kra isthmus would provide a direct maritime route between the Andaman Sea and the Gulf of Siam, significantly shortening the journey for vessels traveling between India and East Asia. In contrast, simply deepening the Malacca Strait would not create a new route and would only enhance the capacity of an already established passage, which does not fundamentally reduce the distance or time required for navigation between these regions. This concept reflects the importance of geographical chokepoints and trade routes in maritime economics, a topic relevant to discussions of global trade dynamics in standard UPSC materials.