Final answer:
The correct answer is option B, 'came in handy and was', as it fits the past tense narrative and subject-verb agreement of the sentence within the context provided.
Step-by-step explanation:
The question is asking for the correct verb tense and subject-verb agreement to fit the context of the sentence. The correct answer is B: came in handy and was. This choice correctly matches the past tense narrative of the excerpts provided and agrees in number with the subject 'paddles', which is plural. Using 'comes' or 'come' would imply present tense, which does not agree with the tense used in the provided context. Additionally, 'are useful' does not maintain the past tense consistency required by the sentence.