Challenge 1: Quickly Checking Lighting After Many Small Adjustments — Solution Walkthrough

The answer:

Per this chapter's own material, Eevee fits this need. It renders
quickly, often in a small fraction of a second per frame, which is
exactly what's needed for checking many small adjustments in rapid
succession over a short work session.

Why Cycles would be a poor fit here:

Cycles simulates light physically, tracing individual rays through the
scene, at the direct cost of considerably longer render times per
frame. Using Cycles to check dozens of small adjustments in quick
succession would mean waiting through that longer render time
repeatedly, slowing down the actual iteration process this designer
needs.

Why this matches this chapter's own guidance directly:

Per this chapter's own material, Eevee suits real-time preview work
and fast iteration specifically — situations where render time matters
more than absolute physical accuracy — which is precisely the
situation described here: rapid, repeated checks during an active work
session, not a final polished output.

WHY THIS WORKS AS AN ANSWER
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This exercise checks that a fast-iteration lighting check is correctly
matched to Eevee, rather than Cycles' own slower, more physically
accurate rendering.