The correct answer is: c) Telangana.
Andhra Pradesh and Telangana are the two Telugu-speaking states in India. They share a long history and culture, and their economies are closely linked. In 2020-21, Telangana was the largest trading partner of Andhra Pradesh, accounting for 22.5% of its total trade. The main items traded between the two states are cotton, rice, iron ore, and steel.
Maharashtra is the second largest trading partner of Andhra Pradesh, accounting for 18.4% of its total trade. The main items traded between Maharashtra and Andhra Pradesh are cotton, rice, sugar, and cement.
Tamil Nadu is the third largest trading partner of Andhra Pradesh, accounting for 15.4% of its total trade. The main items traded between Tamil Nadu and Andhra Pradesh are cotton, rice, coffee, and tea.
Karnataka is the fourth largest trading partner of Andhra Pradesh, accounting for 12.3% of its total trade. The main items traded between Karnataka and Andhra Pradesh are cotton, rice, iron ore, and steel.
The other options are incorrect because they are not the primary trading partners of Andhra Pradesh within India.