Correct option is B
Option (b) contains an error. The error is in the verb tense "can," which should be "could" to maintain consistency with the past perfect tense used earlier in the sentence. The corrected part of the sentence should read "I could beat somebody in the ring."
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Grammatical rule used: Consistency in verb tense is crucial when expressing events in the past, especially in conditional or hypothetical contexts. "Could" is the past form of "can" and is used to express ability or possibility in the past.
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Example: Even though he was very young, he believed he could win the race.