Correct Option
The Balkh campaign (1646-1647) under Shah Jahan was primarily a strategic undertaking aimed at securing the Mughal northwestern frontier. The main objective was to ensure a friendly and stable rule in Balkh and Badakhshan. These regions were strategically important as they bordered Kabul, a key Mughal territory, and were frequently subjected to Uzbek incursions. By establishing a friendly ruler, the Mughals sought to create a buffer zone against the persistent threat of Uzbek expansion and protect their Afghan possessions.
Incorrect Options
Option 2: Conquering Samarqand and Farghana, the ancestral lands of Babur, was not the primary motive for Shah Jahan's Balkh campaign. While these regions held historical significance, the campaign's focus was on frontier security rather than reclaiming lost territories or aggressive expansion into Central Asia.
Option 3: While the Amu Darya (Oxus River) served as a natural geographical boundary in the region, Shah Jahan's campaign did not aim to formally fix the Mughal frontier along this specific "scientific line." The objective was more about political influence and buffer creation than a definitive border demarcation.
Option 4: The Balkh campaign was not an attempt to expand the Mughal Empire significantly beyond the Indian subcontinent through imperial conquest. Instead, it was a defensive and strategic maneuver designed to counter Uzbek threats and secure the existing Mughal territories, particularly Kabul, from external aggression.