The correct answer indeed is option 4, Sanyasi Rebellion.

Here is the analysis of each option:

1. Bhil Uprising: The Bhils are indigenous tribes primarily residing in India`s central regions. While they have participated in several revolts against British rule, their uprising does not feature in Bankim Chandra Chatterjee`s novel Anand Math.

2. Rangpur and Dinapur Uprising: These are locations in India where mutinies and rebellions happened against the British Raj, but they don`t feature in the novel Anand Math.

3. Bishnupur and Birbhum rebellion: These are also places in India where rebellion happened against British rule. However, these too are not featured in the novel Anand Math.

4. Sanyasi Rebellion: This is indeed the correct answer. Bankim Chandra Chatterjee`s novel `Anand Math` popularized the Sanyasi Rebellion. The novel, set in the backdrop of the Sanyasi Rebellion, describes the sanyasis` fight against the East India Company in the late 18th century.

Hence, Anand Math is synonymous with the Sanyasi Rebellion.