
Passage: Male brown bears in North America usually attack and kill cubs born to females that are not mated by them. However, during the annual salmon migration season between July and August, among brown bears fishing in Harrow Bay, male brown bears are less than 1/10 likely to attack and kill the cubs of female brown bears, while female brown bears with cubs are dozens of times more likely to encounter male brown bears. In this period when the female brown bear meets the male brown bear most, the cub is the least likely to be killed.
Question: Which of the following options, if true, provides the best explanation for the abnormal behavior of male brown bears?
A. A.Brown bears usually fight to protect their territory, and during the salmon migration season, they focus on their fishing skills and rarely fight for territory.
B. B.Cubs depend on female brown bears for three years to survive on their own, and because female brown bears do not conceive during lactation, cubs aged 3 to 12 months have the highest murder rate.
C. C.Salmon is the main food source for North American brown bears to replenish their body fat. Brown bears struggle to fish to gain weight in order to survive the coming winter.
D. D.In order to protect future cubs, female brown bears usually mate with multiple male brown bears to make more male brown bears think they are the fathers of their cubs.
Answer: