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Sentence Correction: Relative Clauses - One of the + plural noun + who/which/that

Nelson Mandela was one of the few leaders that was successful in conveying optimism, justice, and confidence both inside and outside his country.

This answer choice is grammatically incorrect. The relative clause that was successful...outside a country describes the noun that appears immediately before it, namely, the few leaders. Since the few leaders is plural, the verb that follows it also needs to be plural. However, was is singular.

What helps us identify this question as a Relative Clause question as well as identify the mistake is the following Stop Sign:

one of the + plural noun + who/which/that

Whenever you see this Stop Sign, make sure that the following verb is plural.

Although this answer choice corrects the original Relative Clause error by using the plural verb was to match the plural noun the few leaders, it is grammatically incorrect. The first two items in the list of the sentence are nouns (optimism, justice), but the last item is an adjective (confident). 

[[snippet]]

Very good!

This answer choice corrects the original Relative Clause error by using the plural verb were to match the plural noun the few leaders.

Although this answer choice corrects the original Relative Clause error by using the plural verb was to match the plural noun the few leaders, it is grammatically incorrect. The last two items in the list of the sentence are nouns (justice, confidence), but the first item is an adjective (optimistic). 

[[snippet]]

Although this answer choice corrects the original Relative Clause error by using the plural verb was to match the plural noun the few leaders, it is grammatically incorrect. The first two items in the list of the sentence are nouns (optimism, confidence), but the last item is a verb (bringing). 

[[snippet]]
was successful in conveying optimism, justice, and confidence
were successful in conveying optimism, justice, and confident
were successful in conveying optimism, justice, and confidence
were successful in conveying optimistic, justice, and confidence
were successful in conveying optimism, confidence, and bringing justice