Grand Trunk (GT) Road from Lahore to Calcutta (in undivided India) was constructed during the reign of which period?

Introduction / Context:
The Grand Trunk (GT) Road is one of South Asia’s oldest and most important road corridors. Knowing its historical construction anchors the evolution of road building and administration on the subcontinent.

Given Data / Assumptions:

• We focus on the Lahore–Calcutta stretch in undivided India.
• We identify the main reconstruction and formalization in the medieval era.

Concept / Approach:
Sher Shah Suri is historically credited with extensive construction and organization of the GT Road in the 16th century, including milestones (kos-minars), sarais (rest houses), and a basic administration for road users. The pivotal period is 1540–1545 AD during his reign.

Step-by-Step Solution:
Identify key ruler associated with GT Road: Sher Shah Suri.Recall the years of his major works: 1540–1545 AD.Select the corresponding option.

Verification / Alternative check:
Multiple historical references attribute the systematic development of GT Road to Sher Shah’s administrative reforms and investments in road infrastructure during this period.

Why Other Options Are Wrong:

• Ancient/BCE dates do not match the organized, waystation-equipped GT Road as known historically.
• Other AD options listed do not align with the Suri reign’s key road-building burst.

Common Pitfalls:

• Confusing initial trade tracks with the formally reconstructed GT Road.
• Attributing GT Road to later colonial improvements rather than earlier medieval reconstruction.

Final Answer:
1540–1545 AD