Directions: In the sentence below, identify the part containing a grammatical or idiomatic error, if any. Ignore punctuation errors.

Until lately, researchers have found no reliable (A) / evidence whether hosting the (B) / global sports festival has enhanced (C) / a nation’s international influence (D) / No error (E)

The correct option is B.

Detailed Breakdown:
The error lies in part (B) of the sentence: "evidence whether hosting the".

Explanation:
1. Grammatical & Idiomatic Error: The noun "evidence" should be followed by the conjunction "that" when introducing a noun clause that specifies the content of the claim being evaluated. Thus, the phrase "evidence whether" is unidiomatic here and should be replaced with "evidence that".
2. Role of "Whether": The conjunction "whether" is used to express alternatives or indirect questions (e.g., "He asked whether she was coming"). In this context, the sentence refers to evidence supporting a specific statement or outcome, making "that" the correct conjunction to connect the noun "evidence" to its complement clause.

Corrected Sentence:
"Until lately, researchers have found no reliable evidence that hosting the global sports festival has enhanced a nation’s international influence."

Analysis of All Parts:
• Part (A): "Until lately, researchers have found no reliable" — Correct. The phrase "Until lately" is an idiomatic expression meaning "until recently", and the present perfect tense "have found" is used appropriately.
• Part (B): "evidence whether hosting the" — Incorrect. Should be revised to "evidence that hosting the".
• Part (C): "global sports festival has enhanced" — Correct. The singular verb "has enhanced" correctly agrees with the gerund subject "hosting".
• Part (D): "a nation’s international influence" — Correct possessive form and noun phrase.