Analogy — Choose the correct “work → creator” mapping: Book : Author

Introduction / Context:
The stem presents a “work → creator” relation: a book is authored by an author. We must find the option where the first item is a creative work and the second is the person who creates it.

Given Data / Assumptions:

• “Book→author” is a canonical work–creator mapping.
• Analog should reflect artwork/creation vs its human originator.

Concept / Approach:
Eliminate cause–effect, instrument–effect, or category–member options. Prefer a recognized art form paired with its maker.

Step-by-Step Solution:
(a) Rain : Flood → cause→effect meteorological relation.(b) Light : Switch → switch controls light; not a creator.(c) Symphony : Composer → a composer creates a symphony; matches.(d) Song : Music → instance vs category, not creator.

Verification / Alternative check:
Both “book→author” and “symphony→composer” are standard creator relations in language tests.

Why Other Options Are Wrong:
They lack the creator role or confuse categories and mechanisms.

Common Pitfalls:
Mistaking controller/instrument relations (switch→light) for creator relations.

Final Answer:
Symphony : Composer