The grammatically and meaningfully correct sentence is (a). There are no grammatical errors in this sentence, and it effectively conveys its intended meaning. The sentence contrasts how the individual's qualities are perceived by two different groups: those who are highly intellectual ("first-class mind") and those who are average undergraduates.
The error in option (b) lies in the verb tense agreement. The sentence starts in the past tense ("embarked"), indicating that the action of embarking on the expedition occurred in the past. However, the verb "marvel" is in the present tense. To maintain consistency and reflect that all actions described occurred in the past, "marvel" should be in the past tense. Therefore, the correct form should be "marvelled" instead of "marvel."
The correct sentence is: After years of dreaming, I finally embarked on a once-in-a-lifetime expedition to Antarctica, where I navigated through icebergs aboard an expedition ship, encountered colonies of penguins and seals, and marvelled at the awe-inspiring landscapes of untouched wilderness at the bottom of the world.
The error in option (c) is related to subject-verb agreement. The subject of the sentence is "Retailers like H&M and Zara," which is plural. However, the verb "has" is singular. It should be "have" (plural) to agree with the plural subject "Retailers."
The correct sentence is: Retailers like H&M and Zara have introduced eco-friendly fashion lines featuring sustainable materials and minimalist designs.
The error in option (d) is related to subject-verb agreement. The subject "International agreements" is plural, but the verb "has" is singular. It should be "have" (plural) to match the plural subject.
The correct sentence is: International agreements on climate change mitigation have faced challenges from developing nations, wary of their impact on economic development and industrial growth. Hence, (a) is the correct answer.
NOTE:
Subject-verb agreement means that a subject and its verb must be both singular or plural:
A singular subject takes a singular verb.
A plural subject takes a plural verb.
For example, in the sentence 'John lives in France', the subject John (singular 'he') 'agrees with' the third person singular form of the verb to live - lives.
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