In the administrative geography of Bangladesh, which of the following is the largest district by area?

Introduction / Context:
Knowledge of the largest administrative units by area or population is a typical part of country specific general knowledge. In the case of Bangladesh, the largest district by area is important for questions on regional geography and administrative divisions.

Given Data / Assumptions:

• The focus is on the largest district in Bangladesh by area.
• Options include Narayangunj, Chittagong, Khagrachari, and Rangamati.
• We must identify which district occupies the greatest land area.

Concept / Approach:
The Chittagong Hill Tracts region in southeastern Bangladesh contains several large hilly districts. Among them, Rangamati is recognised as the largest district in Bangladesh in terms of area. Narayangunj is an industrial and urban district, Chittagong district includes a major port city but is not the largest by area, and Khagrachari is also in the hill tracts but smaller than Rangamati.

Step-by-Step Solution:
Step 1: Recall that the hill tracts, especially Rangamati, cover extensive hilly and forested terrain.Step 2: Recognise that Narayangunj is mainly a compact industrial area near the capital region.Step 3: Understand that Chittagong district, though important, is more coastal and not the largest by area.Step 4: Compare Khagrachari and Rangamati, remembering that Rangamati extends over a larger hilly area including parts around Kaptai Lake.Step 5: Choose Rangamati as the largest district by area.

Verification / Alternative check:
Official statistics and geography references on Bangladesh consistently list Rangamati as the largest district in terms of area. A map of Bangladesh showing district outlines makes it clear that Rangamati occupies a very large portion of the southeast hill region compared to the other districts mentioned.

Why Other Options Are Wrong:
Narayangunj, despite economic significance, is relatively small in land area. Chittagong is an important port district but not the largest geographically. Khagrachari is a hill district with significant size but still smaller than Rangamati. Therefore none of these matches the superlative description given in the question.

Common Pitfalls:
Students sometimes choose Chittagong because of its fame as a port city and commercial hub. Others may not differentiate clearly between hill districts. Remembering that the largest district lies in the Chittagong Hill Tracts and specifically that Rangamati holds that record will prevent such mistakes.

Final Answer:
The largest district by area in Bangladesh is Rangamati, which is the correct option.