Identify the errors in the following sentence:Jack was in the conference room discussing plants with other committee members when the chairman had called to say he’d be late.

Identify the errors in the following sentence:Jack was in the conference room discussing plants with other committee members when the chairman had called to say he’d be late.

A.discussing

B.other

C.had called

D.he’d be late

请帮忙给出正确答案和分析，谢谢！