This question addresses the specific timelines for administrative actions concerning movable encroachments. 3 days is the correct answer because administrative procedures often stipulate short, consistent periods for urgent matters like movable encroachments to ensure swift action and removal. This uniformity in timeframes for both replying to a show-cause notice and complying with a removal order streamlines the process and prevents prolonged obstruction.
1 day (A) is generally too short for a formal reply or compliance.
7 days (C) is typically longer than the period allotted for movable encroachments, which are often considered more urgent.
15 days (D) is significantly too long for a movable encroachment, which requires prompt resolution.