Final answer:
Without the exact exponent for object A, we can still determine that object A is more massive than object B by converting object B's mass to kilograms and knowing that any positive exponent for a mass in kilograms would result in a larger value than 9.02 x 10^-31 kg.
Step-by-step explanation:
To determine which object is more massive, we need to compare their masses and ensure they're in the same units. Given that the mass of object A is 1.72 x 10 kg (the exponent is missing here, so we'll assume the notation is incorrect and skip to object B), and the mass of object B is 9.02 x 10^-28 g, we should convert grams to kilograms to make a proper comparison. Since there are 1,000 grams in a kilogram, object B's mass in kilograms is 9.02 x 10^-31 kg.
In comparison, virtually any positive exponent for object A's mass in kilograms (1.72 x 10^any_positive_number) would be vastly larger than object B's mass. Thus, object A is more massive than object B without needing the exact exponent for object A, as long as we know it's a positive number. By comparing the magnitudes with the knowledge that grams need to be converted to kilograms, we can conclude that option 1 is true: Object A is more massive than B.