Final answer:
The error in the sentence is part (b), where the plural pronoun 'their' should be replaced with the singular 'his or her' to agree with the singular antecedent 'each one.'
Step-by-step explanation:
The sentence in question contains an error in part (b). The error is the use of the plural possessive pronoun 'their' which does not agree in number with the singular antecedent 'each one.' The sentence should maintain consistency by using singular pronouns to refer to singular antecedents. Therefore, the correct pronoun should be 'his or her' instead of 'their' to match the singular 'each one.' An example of a correct sentence would be: 'This is a strange world where each one pursues his or her own golden bubble and laughs at others for doing the same.'
Understanding the rules of subject/verb agreement and correct pronoun usage is essential to ensuring that a sentence conveys its intended meaning clearly. Phrases like 'each one' call for singular pronouns, and the error presents a common issue of pronoun-antecedent agreement in English grammar.