The correct answer is: A. How have you managed it?
The other options are incorrect because they do not use the past participle “managed” in the correct way.
- B. Did you manage it? This option uses the simple past tense, which is not appropriate for a question about something that happened in the past.
- C. How did you manage it? This option uses the simple past tense, which is not appropriate for a question about something that happened in the past.
- D. Was it managed by you? This option uses the passive voice, which is not appropriate for a question about something that happened in the past.
The past participle “managed” is used to form the perfect tenses, which are used to talk about things that happened in the past. In this case, the question is asking about something that happened in the past, so the past participle “managed” is the correct verb form to use.
The past participle “managed” can also be used to form the passive voice, which is used to talk about things that happened to someone or something, rather than something that someone or something did. In this case, the question is not asking about something that happened to someone or something, so the passive voice is not the correct verb form to use.