My problem with this question is that the passage never actually tells us what happens if we are WITHIN the transition temperature RANGE. D says what will happen if it is heated to its glass transition temperature. But what does that mean? The upper end of the range, or the lower end of the range? We know that, above the range entirely, we are a liquid; this is pretty reasonable to interpret based on the information in the passage. But above the lower end (and below the upper end) of the transition temperature, we are in the transition range and the passage doesn't tell us what behavior is like at all! I feel like the wording in the answer choices is too ambiguous. The passage clearly treats the transition temperature as a range (it says that glass takes on the physical properties of a solid below the LOWER END of this range), but the answer choices don't reflect this nuance whatsoever.
My problem with this question is that the passage never actually tells us what happens if we are WITHIN the transition temperature RANGE. D says what will happen if it is heated to its glass transition temperature. But what does that mean? The upper end of the range, or the lower end of the range? We know that, above the range entirely, we are a liquid; this is pretty reasonable to interpret based on the information in the passage. But above the lower end (and below the upper end) of the transition temperature, we are in the transition range and the passage doesn't tell us what behavior is like at all! I feel like the wording in the answer choices is too ambiguous. The passage clearly treats the transition temperature as a range (it says that glass takes on the physical properties of a solid below the LOWER END of this range), but the answer choices don't reflect this nuance whatsoever.