Francis Buchanan, also known as Francis Buchanan-Hamilton, was a Scottish physician, geographer, and naturalist who conducted extensive surveys and studies in India during the late 18th and early 19th centuries. He served in the East India Company and held various positions in Bengal. The quote in question reflects Buchanan's observations during his travels. He was known for his keen interest in the geography, natural history, and socio-economic conditions of the regions he visited. "Gunjuriya" likely refers to a place or region he explored, and the quote emphasizes the potential for development and prosperity in that area if it were properly cultivated. Buchanan's works provide valuable insights into the diverse aspects of India's geography, flora, fauna, and the conditions of its people during the British colonial period.

So, the correct option is [4].