Read the passage below carefully:
The ancient city walls of Kano, known locally as Badala, were initially constructed between 1095 and 1134 AD under the reign of Sarki Gijimasu to safeguard the settlement against external invasions. Expanded significantly during the fourteenth century, the defense system encompassed an extensive network of sun-dried mud brick structures, reinforced by an outer trench known as a gara. Contrary to common assumptions that the wall served purely defensive military functions, historical administrative records from the sixteenth century document that the sixteen gated entrances were primarily utilized to regulate incoming commercial traffic and systematically collect trade tariffs on commodities such as indigo-dyed cloth and leatherware.
Statement: Based on the passage, the sixteen gated entrances of the Kano city walls were originally constructed in the eleventh century for the primary purpose of collecting trade tariffs.
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