Exercise 1: Sizes, Colors & the Right Product Type — Possible Solution
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THE RIGHT TYPE: VARIABLE
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Per this chapter, a Variable product is exactly this case: a parent
product defining attributes (here, Size and Color) where each
specific combination becomes its own variation with its own price
and stock. Three sizes times two colors gives six variations, each
priced and stocked independently - precisely the scenario this
chapter describes for a T-shirt example, applied here to a hoodie.

WHY SIMPLE DOESN'T FIT
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Per this chapter, a Simple product has exactly one price, one SKU,
and one stock count, with no options to choose. It has no mechanism
at all for representing multiple purchasable combinations, so it
cannot capture "three sizes, two colors, priced and stocked
separately" - that's the entire feature Variable products exist to
add.

WHY GROUPED DOESN'T FIT
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Per this chapter, a Grouped product is a collection of already-
existing, separately-listed Simple products displayed together, with
no price or stock of its own. Using it here would mean creating six
separate, independent Simple products (one per size/color
combination) and then grouping them - which technically could work,
but throws away the single unified product page, shared attributes,
and shared description that Variable products are specifically built
to provide.

WHY THIS WORKS AS AN ANSWER
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It correctly identifies Variable as the fitting type, and explains
precisely why each rejected alternative fails to represent priced-
and-stocked-separately combinations under one shared product listing.