Section 81 IPC excuses an act done WITH knowledge but WITHOUT criminal intent, where the act is done in good faith to prevent or avoid:

1. Section 81 IPC: 'Nothing is an offence merely by reason of its being done with the knowledge that it is likely to cause harm, if it be done without any criminal intention to cause harm, and in good faith for the purpose of preventing or avoiding other harm to person or property.' 2. The Explanation states: it is a question of fact in each case whether the harm to be prevented was so imminent or so great as to justify the running the risk. 3. This is the IPC counterpart of the common-law NECESSITY doctrine (e.g. Dudley v. Stephens (1884) 14 QBD 273 famously refused necessity for murder). 4. The harm caused must be proportionate to the harm avoided (proportionality is implicit in 'good faith'). 5. Hence option A is correct. _Source: Indian Penal Code 1860 / Code of Criminal Procedure 1973 / Indian Evidence Act 1872 (Bare Acts, indiacode.nic.in) — IPC, Section 81 (Necessity, doctrine of greater good)_