Denotation is my best answer, sorry if its wrong.
The main reasons are to protect your legal identity & privacy.
Another reason is to brand yourself like they do in the entertainment industry (some examples are: Oprah, Pink, Shakira, Madonna, Ice-T, etc.)
We see that the obstacles that the people that found gold in California during the Gold Rush faced are: D. Traveling over land or sea and living in mining camps.
<h3>What is the California Gold Rush?</h3>
The California Gold Rush was actually known as a period when there was rapid movement of treasure seekers who came to California when gold was discovered at Sutter's Mill. It began in early 1848. It's estimated that over 300,000 came to that territory.
The challenge the people faced were travelling long distances to California over land and sea and also living in mining camps.
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