Read the following context and choose the best option to answer the question.
Context: Lee Randall , Assistant Editor ( Magazines & Arts ) of The Scotsman writes me of her encounter with Liberace . It 's so well done I had to share it .... Many years ago I " met " Liberace . For reasons that too many Vodka Gimlets have obscured in my memory , he was at the American Booksellers Association convention ( ABA ) back in the day , when I still worked in book publishing .
Question: What may be the reason why vodka affected their memory ?
Options: 
A. Because they have a problem with drugs .
B. None of the above choices .
C. Because they have been an alcoholic for so long .
D. Because they drank too much .


D