Mark the letter A,B,C or D to indicate the sentence that best combines each pair of sentences
The advertised product had just been on sale.Customers realized it had lots of defects.
A. But for the advertised product had been on sale did customers realize it had lots of defects.
B. Not until had the advertised product been on sale,customers realized it had lots of defects.
C. Only after the advertised product had been on sale customers realized it had lots of defects.
D. Hardly had the advertised product been on sale when customers realized it had lots of defects.