【单选题】Why do you think the old man told Austen about the life-cleaner before selling the love potion?
A.
He knew that everyone needed life-cleaner.
B.
He knew for sure that Austen's possessive love wouldn't last long and he would buy the "chaser" to be free from the women for whom he had precisely bought the love potion
C.
He wanted to make more money by selling the life-cleaner.
D.
He knew that Alan was a merciless person who liked to kill others.