I think you forgot to give the options along with the question. i am answering the question based on my knowledge and research. "One group of bears was less highly evolved less than the two other groups and was destined to die out" is the one that explains why only one group of bears were extinct. I hope the answer has helped you.
I think its a hypothesis (let me know if i'm wrong)
Ohho... The answer is a substance abuse course, however expect to be imprisoned because that is a felony. (Also I'm assuming you mean't a BAC of 0.05%.).
