The correct answer is: a) Visakhapatnam.
Visakhapatnam is the largest city in Andhra Pradesh, India. It is located on the Bay of Bengal, and is the headquarters of the Visakhapatnam district. The city has a population of over 3.5 million people, and is a major industrial and commercial center. Visakhapatnam is also a popular tourist destination, due to its beaches, temples, and historical sites.
B) Vijayawada is the second largest city in Andhra Pradesh, and is the capital of the state. The city has a population of over 2.5 million people, and is a major commercial and educational center. Vijayawada is also a major religious center, as it is home to the Tirumala Venkateswara Temple, one of the most popular Hindu temples in India.
C) Tirupati is a city in Andhra Pradesh, and is home to the Tirumala Venkateswara Temple. The temple is one of the most popular Hindu temples in India, and attracts millions of pilgrims every year. Tirupati is also a major commercial and educational center.
D) Guntur is a city in Andhra Pradesh, and is the third largest city in the state. The city has a population of over 1.5 million people, and is a major commercial and educational center. Guntur is also a major agricultural center, as it is located in the heart of the Andhra Pradesh rice bowl.