The correct answer is option 'A', Pali.

Explanation:
The Tripitaka is a collection of Buddhist scriptures written in the Pali language.

What is Tripitaka?
The Tripitaka is a collection of Buddhist scriptures that consist of three main sections: the Vinaya Pitaka, the Sutta Pitaka, and the Abhidhamma Pitaka. It is considered to be one of the earliest and most important written compilations of Buddhist teachings.

Pali Language:
Pali is a language that belongs to the Indo-Aryan family of languages. It is a Prakrit language, which means it is derived from Sanskrit. Pali was the language used in the early Buddhist texts and was the language of the Buddhist scriptures.

Importance of Tripitaka:
The Tripitaka is considered to be one of the most important written compilations of Buddhist teachings. It contains the teachings of the Buddha and is a guide for Buddhists to live their lives according to Buddhist principles. The Tripitaka is also an important source for scholars studying Buddhism and its history.

Conclusion:
In conclusion, the Tripitaka was written in the Pali language, which is a Prakrit language derived from Sanskrit. It is a collection of important Buddhist scriptures that contains the teachings of the Buddha and is considered to be one of the most important written compilations of Buddhist teachings.