The correct answer is D. Dang.
Dang district is located in the south-western part of Gujarat, India. It is a hilly district with a tropical climate. The average annual rainfall in Dang district is 3,000 mm. The monsoon rains are the main source of rainfall in the district. The monsoon season starts in June and ends in September. The highest rainfall is recorded in July and August.
The other options are incorrect. Bharuch district is located in the south-central part of Gujarat. It has a semi-arid climate. The average annual rainfall in Bharuch district is 750 mm. Patan district is located in the north-central part of Gujarat. It has a semi-arid climate. The average annual rainfall in Patan district is 600 mm. Aravalli district is located in the north-eastern part of Gujarat. It has a semi-arid climate. The average annual rainfall in Aravalli district is 500 mm.