Read the passage below carefully and evaluate the statement that follows:
The ancient City Walls of Kano, constructed between the 11th and 14th centuries, were originally built to protect the inhabitants of Kano from external invasions. Measuring approximately 14 kilometres in circuit, the massive earthen ramparts featured sixteen strategic gates, each guarded by a security officer known as the Sarkin Kofa. Unlike contemporary fortifications in Northern Africa that primarily utilized stone and mortar, the Kano walls were sculpted entirely from sun-dried mud bricks and reinforced with local timber. Although minor structural repairs were recorded in 1903 following British colonial occupation, substantial portions of the outer wall system collapsed during the heavy rains of 1955 due to prolonged neglect.
Statement: According to the passage, the ancient City Walls of Kano were constructed primarily using stone and mortar imported from Northern Africa.
Answer: Answer