The correct answer is (d) All of these.
Under Section 96 of the Indian Penal Code, 1860, the right of private defence of the body extends to causing death when the person apprehends that he will be killed or so grievously hurt that he may be in danger of death, and there is no time to escape or to avoid the danger by flight.
Apprehension of death means a reasonable belief that death is imminent. Kidnapping is the unlawful taking and carrying away of a person by force or fraud, or seizing and detaining a person against his will. Acid attack is a form of violence in which a corrosive substance is thrown or sprayed on a person, causing severe burns and disfigurement.
In all of these cases, the person who is attacked may use deadly force to defend himself, if he believes that it is necessary to do so in order to prevent death or grievous hurt.