The correct answer is: a) Visakhapatnam.
Visakhapatnam is a port city and industrial area in the Indian state of Andhra Pradesh. It is the third largest city in the state after Hyderabad and Vijayawada. Visakhapatnam is located on the Bay of Bengal, and is a major port for both domestic and international trade. The city is also home to a number of industries, including steel, petrochemicals, and pharmaceuticals.
Vijayawada is the capital of Andhra Pradesh. It is a major commercial and cultural center, and is home to a number of educational institutions. Vijayawada is located on the Krishna River, and is a major transportation hub.
Tirupati is a Hindu pilgrimage center in Andhra Pradesh. It is home to the Tirumala Venkateswara Temple, one of the most popular temples in India. Tirupati is located on the Tirupati Hills, and is a major tourist destination.
Guntur is a city in Andhra Pradesh. It is a major agricultural and industrial center, and is home to a number of educational institutions. Guntur is located on the Krishna River, and is a major transportation hub.
In conclusion, the largest industrial area in Andhra Pradesh is located near Visakhapatnam.