Analogy — Smaller-to-larger of the same kind: Brook : River :: Path : ? Choose the larger analogue of the same category as a brook is to a river.

Introduction / Context:
A brook is a small natural watercourse; a river is the larger counterpart. The roadway analogue is a path (small) to a highway (large).

Why Other Options Are Wrong:

• Pen : Paper — Tool-to-medium, different category.
• Yard : Alley — Yard is an area; alley is a passage; not scale variants of one category.
• Vein : Artery — Different vessel types; not merely size variants.
• None of these — invalid since a correct pair exists.

Final Answer:
Path : Highway