The mango variety which occupies largest area in Uttar Pradesh is:

Chausa
Dashehari
Langra
Safeda

The correct answer is (a) Chausa.

Chausa is a mango variety that is grown in the Indian state of Uttar Pradesh. It is one of the most popular mango varieties in India and is known for its sweet and juicy flesh. Chausa mangoes are typically harvested in the summer months and are a popular fruit to eat fresh or use in desserts.

Dashehari is another popular mango variety that is grown in Uttar Pradesh. Dashehari mangoes are known for their thin skin and sweet, aromatic flesh. They are typically harvested in the late summer or early fall.

Langra is a mango variety that is grown in the Indian states of Uttar Pradesh and Bihar. Langra mangoes are known for their large size and sweet, fibrous flesh. They are typically harvested in the late summer or early fall.

Safeda is a mango variety that is grown in the Indian states of Uttar Pradesh and Bihar. Safeda mangoes are known for their white flesh and sweet, aromatic flavor. They are typically harvested in the late summer or early fall.

Chausa mangoes are the most popular mango variety in Uttar Pradesh. They are known for their sweet and juicy flesh. Chausa mangoes are typically harvested in the summer months and are a popular fruit to eat fresh or use in desserts.