To determine the best option for the chocolate artist to ensure that the temperature inside the box stays within the desired range during longer trips, we should consider the information provided about the effectiveness of the temperature-control packs.
Since the artist's initial test results indicate that the temperature within the box remains acceptable for one hour, but becomes too hot after two hours, this suggests that the current temperature-control pack is not sufficient for extended trips.
Now, let's analyze the options:
A. She can make a larger temperature-control pack using less of the same chemical.
- This option does not seem effective because using less chemical in a larger pack might not provide sufficient cooling or heating capacity.
B. She can make a smaller temperature-control pack using less of the same chemical.
- This option would likely reduce the cooling/heating capacity further, making it more difficult to maintain the temperature range.
C. She can add a second temperature-control pack that is identical to the first pack to the box.
- This would double the cooling/heating capacity, which would likely be effective in keeping the temperature stable for a longer period.
D. She can add a second temperature-control pack with the coldest possible temperature to the box.
- While this sounds effective, the term "coldest possible temperature" is vague and may not be practical or efficient. The effectiveness would depend on the specific substance used and its characteristics.
Considering efficacy and practicality, C is the best option. Adding a second identical temperature-control pack should provide enough additional cooling capacity to maintain the desired temperature range during longer trips.
So, the best update to the design for longer trips is:
C. She can add a second temperature-control pack that is identical to the first pack to the box.