Which of the Following Is Most Likely Incorrect

Which of the following is most likely incorrect?

A) Mr. D promised to deliver to Mr. C 100 bottles of Japanese red wine of a specified brand. Without the knowledge of Mr. D, production of the wine had been stopped. Despite earnest efforts, Mr. D could only deliver ninety (90) bottles. Mr. O's obligation is deemed fulfilled.
B) In the immediately preceding letter (a) , Mr. D could recover as though there had been a delivery of 100 bottles.
C) Mr. D promised to deliver 100 sacks of a certain type of rice. He delivered only 90 sacks but the obligee did not object to the incomplete delivery. The obligation may be deemed fully perform