Vamos analisar cada uma das opções para identificar qual delas apresenta todas as frases corretamente escritas em relação ao uso de Tag Endings. Opção A: 1. They don’t know how to play the guitar, do they? (correta) 2. She is sending her farmhouse, aren’t you? (incorreta - deveria ser "isn't she?") 3. It has been years since we talked to each other, hasn’t it? (correta) 4. My maid is cooking dinner now, isn’t she? (correta) 5. The reporters are asking those people what happened, are they? (correta) Opção B: 1. They were having dinner when you arrived, weren’t they? (correta) 2. I should walk faster, shouldn’t you? (incorreta - deveria ser "shouldn't I?") 3. Your parents are traveling abroad, weren’t they? (incorreta - deveria ser "aren't they?") 4. Nobody can come in, can’t they? (correta, mas "nobody" é singular, então o correto seria "can he/she?") 5. She is an engineer, is she? (incorreta - deveria ser "isn't she?") Opção C: 1. You didn’t do your English homework, did you? (correta) 2. Her sister went to school by bus yesterday, didn’t she? (correta) 3. They shouldn’t come so late today, should they? (correta) 4. You are traveling this afternoon, aren’t you? (correta) 5. It is raining a lot in California, isn’t it? (correta) Opção D: 1. You could stay longer with me, couldn’t you? (correta) 2. We have made a great decision, haven’t they? (incorreta - deveria ser "haven't we?") 3. She is answering all her e-mails now, isn’t she? (correta) 4. He had gone away, (incompleta, falta a tag) Após a análise, a única opção que apresenta todas as frases corretamente escritas em relação ao uso de Tag Endings é a Opção C.