The correct answer is: A. watermelon.
Ambala is a city in the Indian state of Haryana. It is located on the banks of the Yamuna River, about 100 kilometers (62 mi) north of Delhi. Ambala is a major commercial and industrial center, and is also home to a number of educational institutions.
Ambala is famous for its watermelons. The city is known for its sweet and juicy watermelons, which are grown in the fertile soil of the Yamuna River basin. Watermelons are a popular fruit in Ambala, and are often eaten fresh or used in juices and desserts.
The other options are incorrect because they are not fruits that are typically associated with Ambala. Mangoes are a popular fruit in India, but they are not particularly associated with Ambala. Jackfruit is a tropical fruit that is native to Southeast Asia. Apples are a temperate fruit that is not grown in India.