Explanation:

- Option 1: Cartridges

- Cartridges were ammunition used by soldiers, notably became a flashpoint for the revolt due to rumors about the greasing of cartridges with animal fat.

- Not related to propagating ideas.

- Option 2: Ishtahars

- Correct Answer

- These were proclamations or pamphlets circulated to share messages and rally support.

- Important in spreading the rebels' ideologies during the revolt.

- Option 3: Sepoys

- Sepoys were Indian soldiers in the British army.

- Not related to the dissemination of ideas through proclamations.

- Option 4: Taluqdars

- Taluqdars were landowners or tax collectors during British India.

- Not relevant to the distribution of proclamations.