SAT Text Structure and Purpose Question
The food industry has long used thermal technologies to preserve food in large batches. Recent advancements in infrared heating were made through research in Mexico on the preservation of bean flour. Infrared heating is generally considered to be an improvement over more conventional thermal preservation methods: whereas conventional methods transfer energy from the surface of a food to its interior, infrared heating uses high-intensity infrared light to generate heat within the food itself, thus reducing industrial cooking times. Which choice best describes the function of the underlined portion in the text as a whole?
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The trap here
Text Structure: naming what a sentence says instead of what it does — "What is the function of the underlined sentence?" asks for its job in the paragraph, not its content.