It would be a. "We the people of the United States ... do ordain and establish this Constitution for the United States of America."
We can rule out c immediately, because it has dependent clauses standing on its own. B. can also be ruled out, because the clause in-between the hyphen does not read correctly. A. is correct grammatically, but D. is also grammatically correct and it explains it in a quick and understandable way.
Everyday I wake up earlier, to study or to complete the homework I haven't done last night. I go to school at about 11:40 am. I arrive home at 18:00 pm, and I am really tired. After I eat, I play 30 mins on my console or I am reading a book. I do my homework at about 19:00 pm and after I finish, I go to sleep at about 21:00 pm. In the weekend, I wake up at about 10 am, I eat, and I watch a serial for 1-2 hour(s). I hangout with my friends in the afternoon and when I arrive home, I do my homework for the next week. Sunday is that day where you just want to sleep. This is my typical week in my everyday life.