Which of the following phrases given below the sentence should replace the phrase printed in bold letters to make the sentence grammatically correct? Choose the best option among the five given alternatives that reflect the correct use of phrase in the context of the grammatically correct sentence. If the sentence is correct as it is, mark “No correction required” as the answer.

The UN resolution proposed that the country improves its human rights record before further aid is granted.

The correct answer is "the country improve its".

Detailed Explanation:
The sentence uses the verb "proposed" (a verb indicating a demand, recommendation, suggestion, or proposal) followed by a "that"-clause. This grammatical structure triggers the use of the subjunctive mood in English.
In the subjunctive mood, the verb in the "that"-clause must be in its base form (bare infinitive form), regardless of the subject's grammatical number or person. Therefore, the verb following the singular noun phrase "the country" must be the base form "improve", rather than the indicative form "improves" or the future form "will improve".

Let's analyze each of the options:
1. "the country will improve its": Incorrect because it uses future tense instead of the required subjunctive mood form.
2. "the country should improves its": Grammatically incorrect because the modal verb "should" must be followed by a base form verb ("improve"), not a third-person singular verb ("improves").
3. "the country improve its": Correct because it uses the base form "improve" as required by the subjunctive mood after the verb "proposed".
4. "the country had improved its": Incorrect because it uses the past perfect tense instead of the subjunctive mood.
5. "No replacement required": Incorrect because the original sentence uses "improves", which violates the subjunctive mood rule.