Sold over the counter at the turn of the century, the government now prohibits the sale of cocaine derivatives.

A. Sold over the counter at the turn of the century
B. While sold over the counter at the turn of the century
C. Being sold over the counter at the turn of the century
D. Although they were selling them over the counter at the turn of the century
E. Although they were sold over the counter at the turn of the century

OA E

Source: Princeton Review