Final answer:
The sentence written correctly is option A: Sinead was very excited because she was getting married after years of being engaged with her fiancé.
Step-by-step explanation:
The sentence written correctly is option A: Sinead was very excited because she was getting married after years of being engaged with her fiancé. In this sentence, the verb 'was' agrees with the subject 'Sinead' and the pronoun 'she', and the sentence is properly punctuated. The other options have errors in subject-verb agreement or punctuation.
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