Final answer:
The issue of greased cartridges sparked the 1857 rebellion against British rule by symbolizing religious disrespect for Hindus and Muslims required to use them, leading to the Sepoy Mutiny. The correct answer is option: a) It symbolized religious disrespect.
Step-by-step explanation:
The issue of greased cartridges was important in 1857 because it symbolized religious disrespect and initiated a rebellion against British rule.
The introduction of the Enfield Rifle, which used cartridges rumored to be greased with animal fat from cows and pigs, was offensive to both Hindus and Muslims. Hindus regard cows as sacred, while Muslims are forbidden from consuming pig products.
The handling of these cartridges, which involved biting them to load the rifle, meant direct contact with the fat, causing religious outrage. Mangal Pandey, a Hindu sepoy, attacked British officers, leading to his execution and triggering a widespread revolt known as the Sepoy Mutiny or the First War of Indian Independence.