All the interesting (A)/ employees should (B)/ be invited and (C)/involved in the discussion. (D)

Read the sentence to find out whether there is any grammatical or idiomatic error in it. The error, if any, will be in one part of the sentence. The corresponding letter of that part is the answer. If the given sentence is correct as it is, then choose option ‘No error’ as the answer response. (Ignore errors of punctuation, if any).

The correct option is A.

To identify the grammatical error in the sentence, let us analyze it part by part:
- (A) "All the interesting": This part contains a word-choice error. The adjective "interesting" means causing curiosity or interest. However, in the context of employees participating in a discussion, we need an adjective that describes employees who have an interest, share, or concern in the matter being discussed. The correct term to use here is "interested". Therefore, "interesting employees" should be replaced with "interested employees".
- (B) "employees should": This part is grammatically correct and flows naturally from the subject.
- (C) "be invited and": This uses the correct passive voice construction ("be invited") to show that the action is performed on the employees.
- (D) "involved in the discussion.": This correctly completes the passive construction ("be invited and involved") and uses the appropriate preposition "in" after "involved".

By replacing "interesting" with "interested" in part (A), the sentence becomes grammatically and idiomatically correct: "All the interested employees should be invited and involved in the discussion."