Final answer:
Due to a typographical error in the elephant's weight, it's impossible to choose an accurate multiple-choice answer. However, generally, an adult male blue whale is approximately 12.5 times heavier than an adult male African elephant, using realistic weights for both animals.
Step-by-step explanation:
The weight of an adult male African elephant is between 12,000 and 16,000 pounds, which is equivalent to 6 to 8 tons since 1 ton equals 2,000 pounds. However, the question provides an incorrect value for an elephant's weight (9.07×10^8 kg), which is not realistic and seems to be a typographical error. An adult male blue whale, however, weighs around 200,000 pounds (approximately 100 tons). To find out how many times heavier an adult male blue whale is than an adult male African elephant, we can take the higher end of an elephant's weight in pounds (16,000 pounds) and divide the blue whale's weight by this number.
200,000 pounds (whale) ÷ 16,000 pounds (elephant) = 12.5 times heavier.
Since this ratio is not provided in the multiple-choice options and assuming the elephant's weight was mistyped, we can't accurately select an option from a) to d). Therefore, we should clarify the correct weight of an African elephant before proceeding to compare it with the weight of a blue whale.