Mark the letter A, B, C or D on your a...

Câu hỏi: Mark the letter A, B, C or D on your answer sheet to indicate the word or phrase that is OPPOSITE in meaning to the underlined and bold part in the following question.Although Valentine's Day has become a global industry with more than 80 million roses sold worldwide, the origins of the day are unclear and hidden in the mists of time.

A traced back to the ancient people 

B a long time ago and unforgettable

C new enough for anyone to confirm

D still a mystery to everybody