Which one of the following Sultans of Delhi introduced measures for improving the quality of fruits?

Which of the following Sultans introduced “Market Reforms”?

Which one of the following sultans provided employment to the unemployeds?

Which one of the following Sultans is known for having abolished the tax on grains?

Which among the following Sultans of Delhi established the department 'Diwan-i-Kohi' for agricultural development?

Which of the following places was diamond mining carried out during the Delhi Sultanate period?