The correct option is C Injection
Sometimes, an addict can get a sample of heroin, which is adulterated with a dangerous poison, strychnine. Its injection is known as 'hot shot', which can cause quick death. 'hot shot' can also occur, when an addict, used to injecting heroin 3-5% purity, gets a purer blend of the drug.
Thus, the correct answer is option (A), 'Injection'.