Final answer:
Without the initial temperature of the salad and the rate of cooling, it is not possible to calculate the salad's temperature after 20 minutes as per Newton's law of cooling.
Step-by-step explanation:
The problem provided appears to be a physics question involving Newton's law of cooling, which is a model that describes the cooling of a warmer object to the temperature of its environment. However, the question does not include sufficient details, such as the initial temperature of the salad or the rate of cooling which are necessary to calculate the salad's temperature after 20 minutes. Therefore, it's not possible to determine the correct answer option from A) 47.50°F, B) 46.75°F, C) 46.00°F, or D) 45.25°F without this information. The examples provided in the rest of the text demonstrate various applications of energy transfer and temperature change in different contexts, such as cooling soda with ice cubes and heating phase changes using a calorimeter.