A1 for the reason that:
"Why did you do it?" "Because Carlos told me to".
More examples
- He hated being in the army because he had to obey commands.
- The journey was quite quick because the road was clear.
- I didn't tell her that he was late because I didn't want to cause her any alarm.
- Patients were discharged from hospital because the beds were needed by other people.
- I almost missed my flight because there was a long queue in the duty-free shop.
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