When you see a sentence not make sense it's usually because you are leaving out important words or mixing them up in the wrong way in that sentence so due to this knowledge a dangling modifier would be C.
Can you be more specific and the link is not working.
Answer:
c is the awnser
Explanation: i did the question in the morning in k12 and c was the awnser
What? You have to ask a question! Nothing is being asked or anything.
Ans
wer:
The earliest form of trade was BARTERING
2. Negotiating in trade means you are coming to an agreement on an item's value
