Exercise 3: Why Variable Products Risk a Worse CLS Score — Possible Solution
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WHY VARIABLE PRODUCTS ARE MORE PRONE TO THIS
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Per this chapter, a Variable product's page shows price and stock
status that change dynamically "as the shopper selects different
attributes" (per Chapter 2's own Size/Color variation material) - for
example, selecting a different size might reveal a different price or
an "out of stock" status for that specific combination. A Simple
product has no such attribute-selection step at all, since it has
exactly one price and one stock status that never change based on any
on-page interaction - so there's nothing analogous that could shift
the layout after the initial page load.

WHY THIS CAUSES A LAYOUT SHIFT
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Per this chapter, if the space for the price/stock text isn't
reserved ahead of time, the surrounding page content shifts position
each time the displayed price or stock text changes length or
appears/disappears in response to a variation selection - exactly
what Cumulative Layout Shift measures.

WHAT THIS CHAPTER RECOMMENDS
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Per this chapter, "reserving stable layout space for these values
avoids a visible shift each time a selection changes" - allocating
fixed space for the price/stock area in advance, so that updating its
content doesn't need to push any other page content up or down.

WHY THIS WORKS AS AN ANSWER
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It correctly identifies the attribute-selection-driven price/stock
change as the mechanism unique to Variable products that Simple
products don't share, and correctly states this chapter's own
recommended fix of reserving stable layout space in advance.