Tại sao các đa giác ở hình 112, 113, 114 không phải là đa giác lồi?

Mark the letter A, B, C, or D on your answer sheet to indicate sentence that is similar in meaning to the given one
"You should have finished the report by now," John told his secretary.

A. John reproached his secretary for not having finished the report.

B. John said that his secretary had not finished the report.

C. John reminded his secretary of finishing the report on time.

D. John scolded his secretary for not having finished the report.