138. As sales of cars and light trucks made in North America were declining 13.6 percent in late February, many analysts conclude that evidence of a recovering automotive market remains slight.
(A) As sales of cars and light trucks made in North America were declining 13.6 percent in late February, many analysts conclude
(B) Since sales of cars and light trucks made in North America declined 13.6 percent in late February, and many analysts conclude
(C) With sales of cars and light trucks made in North America declining 13.6 percent in late February, with many analysts concluding
(D) Because sales of cars and light trucks made in North America declined 13.6 percent in late February, many analysts concluded
(E) Because of sales of cars and light trucks made in North America declining 13.6 percent in late February, therefore, many analysts concluded
请问b选项中的and,是否使后面的句子变成了since原因状语从句的一个并列分句，因而错误？
二问and是否不能连接主从句？？ | 
