Even though you didn't give us the fragment with the comma slice, it isn't really necessary here as we can answer just based on these 4 options here. All options apart from the second one are correct - only the second option doesn't fix the mistake of the comma splice, whereas the other options do but connecting the sentences properly.
Answer: Students had a choice between two writing prompts for this contest on immigration policies at the border and in the “Constitution-free zone,” a 100-mile perimeter from land and sea borders where U.S. Border Patrol can search any vehicle, bus, or vessel without a warrant. They could state their positions on the impact of immigration policies on our country’s security and how we determine who is welcome to live here. Or they could write about a time when someone made an unfair assumption about them, just as Border Patrol agents have made warrantless searches of Greyhound passengers based simply on race and clothing.
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Answer:sorry not giving away personal stuff.
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Answer:
need more context
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you need to give the full question
