Process reasoning — Postal workflow from writing to delivery Arrange the following steps in a correct mailing sequence: Post-box Letter Envelope Delivery Clearance (collection from post-box)

Introduction / Context:
Understanding a real-world process end-to-end is a classic sequencing test. Here we track how a physical letter travels from the writer to the recipient through the postal system.

Given Data / Assumptions:

• Letter content is written first.
• The letter is placed in an envelope before mailing.
• Posting is done via a public post-box.
• Clearance means the postal service collects mail from the post-box for sorting and routing.
• Delivery occurs after clearance and processing.

Concept / Approach:
The steps must satisfy temporal and operational constraints: create content → package → deposit → collect → deliver. Any sequence that places delivery before clearance contradicts postal operations.

Step-by-Step Solution:
Write the Letter → 2.Insert into Envelope → 3.Drop into Post-box → 1.Postal Clearance (collection from box) → 5.Final Delivery to addressee → 4.

Verification / Alternative check:
Ask whether each step depends on the previous: a letter must exist before it is enveloped; it must be enveloped before posting; the post must be collected before any delivery is possible.

Why Other Options Are Wrong:
Any option putting delivery before clearance misorders critical postal logistics.Sequences beginning with envelope before letter ignore content creation.

Common Pitfalls:
Confusing 'clearance' with 'customs clearance' or assuming it means final handover. Here, it specifically means collection from the post-box.

Final Answer:
2, 3, 1, 5, 4