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 letter of that part is the answer. If the given sentence is grammatically and contextually correct, then choose option “No error” as your answer response. (Ignore errors of punctuation, if any). No sooner had the negotiations between the two countries resumed (

• A / when both delegations began accusing each other (
• B / of deliberately withholding information that was essential (
• C / to reaching a mutually acceptable agreement. (
• D