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Question 134·Medium·Text Structure and Purpose

The passage is adapted from a memoir about learning to bake.

I had always been content to buy bread from the corner bakery, the way my parents did, until an idle Saturday tempted me into the kitchen. Flour, water, salt—nothing more exotic than a short list of pantry staples. What could be simpler? Or so I thought. Over the next six hours I discovered how obstinate dough can be: refusing to rise, cracking where it should gleam, burning on the outside while staying damp within.

Which choice best describes the function of the underlined sentence in the passage as a whole?