Explanation:

- The earliest Buddhist texts are primarily written in Pali.

- Pali is the language of the Theravada Buddhist cannon, known as the Pali Canon or Tipitaka.

- Apabhramsha is a later stage of language development and is not used for early Buddhist texts.

- Prakrit is a group of Middle Indo-Aryan languages; while it's related, the earliest Buddhist texts are mainly in Pali, which is a form of Prakrit.

- Sanskrit was used for Mahayana Buddhist texts, which came later.

So, the correct answer is:

- Option: 1 - Pali