Final answer:
The mass of the slice of Swiss cheese, converted from grams to ounces, is 0.0184 oz.
Step-by-step explanation:
To convert the mass from grams to ounces, we can use the conversion factor given: 16 oz = 453.6 g. First, we need to convert the mass of the Swiss cheese from milligrams to grams by dividing 42 mg by 1000. This gives us 0.042 g. Then, we can use the conversion factor to convert grams to ounces by dividing 0.042 g by 453.6 g and multiplying by 16 oz. The mass of the slice of Swiss cheese is approximately 0.0184 oz, so the answer is B) 0.0184 oz.