Folder is to document as envelope is to which of the following items.

Introduction / Context:
This analogy question is based on the relationship between a container and what it typically contains. A folder is used to hold documents, so we must identify what an envelope most commonly contains according to everyday usage. Questions like this check whether candidates can see functional relationships instead of only thinking in terms of definitions.

Given Data / Assumptions:

• First pair: Folder : document.
• A folder is an item designed to store and organise documents such as papers and files.
• Second pair: Envelope : ?
• Options: Money, Articles, Letters, Wires.
• We focus on the most typical or standard content associated with an envelope.

Concept / Approach:
The pattern is “container is to usual content.” While folders might occasionally hold other small things, their primary association in an office or study environment is with documents. In the same way, envelopes can hold different objects, but the most standard association is with letters. Postal systems and personal correspondence use envelopes to carry written messages or documents that are considered letters. Therefore, to mirror the first relationship, we must pick Letters for the second pair.

Step-by-Step Solution:
Step 1: Analyse the relationship in Folder : document. Folder is the container, document is the item placed inside. Step 2: Identify the container in the second pair, which is envelope. Step 3: Think about what is most commonly placed inside an envelope in real life. The answer is usually a letter. Step 4: Look at the options and confirm that Letters appears as a clear and direct match. Step 5: Eliminate other options that either describe content less typically or break the logic of the analogy.

Verification / Alternative check:
We can verify by rephrasing in simple sentences: “A folder holds documents” and “An envelope holds letters.” These are normal and widely used ideas. While it is possible to put money or small articles in an envelope, those uses are secondary and not the default association taught in school or used in common speech. In contrast, “envelope is to letters” is a strong and direct link parallel to “folder is to document.”

Why Other Options Are Wrong:

• Money: Envelopes may sometimes carry money, but this is not the standard or primary association.
• Articles: This is a vague term that does not capture the usual purpose of an envelope.
• Wires: These are rarely, if ever, sent in ordinary envelopes and do not reflect everyday experience.

Common Pitfalls:
Some candidates read too much into the question and think of less common uses, such as putting cash in a wedding card envelope. However, analogy questions usually rely on the most common and straightforward relationship. To avoid errors, focus on what an average person would immediately associate with the container in a typical context.

Final Answer:
The correct completion is Envelope : Letters, maintaining the container to usual content relationship of the analogy.