肺炎链球菌能在肺中存活，并引起肺炎，主要是由于该菌能产生（）

A.具抗吞噬作用的荚膜

B.具抗吞噬作用的M蛋白

C.壁磷壁酸

D.C多糖

E.肺炎链球菌溶素

Which of the following statements about how various embedded options benefit the issuers or the bondholders is least accurate The:（）

A. accelerated sinking fund provision favors the issuers.

B. option-adjusted spread directly measures the value of the spread inclusive of the embedded option.

C. conversion provision favors the bondholders if the stock price rises.