Answer:
Mostly by D. Overland trails
Explanation:
The oregon trail was the most popular, and were travelled by thousands if not more people by wagon.
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It was D. <span>Baron Friedrich von Steuben
He was a former </span><span>Prussian officer.</span>
Based on the options given, the answer is a. leave them alone. Laissez-faire means leaving the people on the task and letting them perform on their own. Thank you for your question. Please don't hesitate to ask in Brainly your queries.
The correct answer is Author Zimmermann.