The correct answer is A. Srinagar.
Srinagar is the main fruit producing district in the valley. It is known for its apple orchards, which are spread over an area of about 100,000 hectares. The district produces about 1.5 million tonnes of apples every year, which is about 80% of the total apple production in the state of Jammu and Kashmir.
The other options are incorrect because they are not main fruit producing districts in the valley.
Baramulla is a district in the northern part of the Kashmir Valley. It is known for its rice fields, which are spread over an area of about 50,000 hectares. The district produces about 500,000 tonnes of rice every year.
C. Samba is a district in the Jammu region of Jammu and Kashmir. It is known for its wheat fields, which are spread over an area of about 100,000 hectares. The district produces about 1 million tonnes of wheat every year.
D. Kulgam is a district in the south-western part of the Kashmir Valley. It is known for its saffron fields, which are spread over an area of about 10,000 hectares. The district produces about 100 tonnes of saffron every year.