What was the primary function of the defensive oasis wall ('Sur') that surrounds the town of Bahla, spanning over 12 kilometers in length?

Answer and explanation

Correct answer: B. To defend the oasis settlement and aflaj against nomadic raids

  1. Step 1: The mud-brick defensive wall of Bahla (Sur Bahla) stretches over 12 kilometers with watchtowers and fortified gates.
  2. Step 2: It was engineered during the medieval Banu Nabhan period to protect the entire residential community, their palm groves, and their underground aflaj irrigation network from hostile external invaders.
Answer
To defend the oasis settlement and aflaj against nomadic raids.
Why not the others: 'To act as an aqueduct carrying mountain water across the desert' confuses a defensive perimeter wall with an elevated falaj aqueduct; 'To serve as a decorative boundary separating tribal farmlands' underestimates the military fortification engineering; 'To confine livestock within the town market square' is historically inaccurate.

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