Step 1: Exhibitionism is a sexual perversion in which a person obtains sexual gratification by deliberately exposing the genitalia in public.
Step 2: Because it amounts to an obscene act done in a public place that annoys others, it falls under Section 294 of the Indian Penal Code.
Step 3: Section 294 IPC prescribes punishment of imprisonment up to 3 months or fine, or both, for obscene acts and songs in public. This makes option (b) correct.
Step 4: Sections 290, 291 and 230 deal with public nuisance, continuing nuisance after injunction and coin-related offences respectively, so they do not apply to exhibitionism.