Option 1 states that both statements are individually true and that Statement II is the correct explanation of Statement I.
Statement I says that the US Army built the Stilwell Road in 1943 from Ledo in Assam to the China-Burma Road. This statement is true. The Stilwell Road was indeed built by the US Army during World War II to establish a land route between India and China.
Statement II says that the objective of building the Stilwell Road was to link with the Bengai-Assam Railway and carry support for the US and the UK in their warfare against Japan. This statement is also true. The purpose of building the Stilwell Road was to provide a land supply route from India to China to support the Allied war effort against Japan.
Therefore, Option 1 is correct as both statements are true and Statement II correctly explains the objective of building the Stilwell Road.