The work of Ashvaghosha includes Sariputraprakarana, Buddhacharita, and Saundarananda. However, the work Manjushrimulakalpa is not attributed to Ashvaghosha. It is important to understand the significance of these works to further clarify why option 4 is the correct answer.

1) Sariputraprakarana: This is a Buddhist text that focuses on the life and teachings of Sariputra, one of the chief disciples of Gautama Buddha. It provides insights into Sariputra`s spiritual journey and his understanding of Buddhist philosophy.

2) Buddhacharita: This is a famous Sanskrit poem written by Ashvaghosha that narrates the life and teachings of Gautama Buddha. It is divided into various chapters, including Buddha`s birth, renunciation, enlightenment, and the establishment of his teachings.

3) Saundarananda: Another significant work by Ashvaghosha, Saundarananda is a Buddhist text that portrays the life of Nanda, the half-brother of Gautama Buddha. It explores his journey from a hedonistic life to becoming a dedicated follower of Buddhism.

4) Manjushrimulakalpa