(B) 21 Days
The Draft Offer Document is available on the SEBI website for public comments for a period of 21 days from the filing of the Draft Offer Document with SEBI.
Source: Chapter 3, "What does 'Draft Offer document' mean?"
The passage clearly states: "The Draft Offer Document is available on the SEBI website for public comments for a period of 21 days from the filing of the Draft Offer Document with SEBI." Students often confuse this with the 30-day period (which is the minimum time before filing the red herring prospectus with ROC) — note these are two different timelines. Always read carefully what each time period refers to.