The answer is It tells the reader what will be discussed.
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The second alternative is correct (B).
"Gold in California ignited interest in a railroad to reach the West. However, Americans disagreed on where to build the railroad."
The use of the conjunction "however" in this context connects the two sentences with a contraposition, giving the exact meaning for the continuity of the text. In this way, it became clear that there was a need to build a railroad, but there was no unity among Americans about where to build the railroad.
I believe the answer to this is "true." Really, all conclusions on all events are subjective. But considering history, conclusions on events are especially prone to subjectivity. Consider who writes the history books. If one country wins a war against another country, they will write about themselves as the noble party and portray the enemy as villainous. However, this may not be the real case. This occurs much more than we think, and we must research different events to make sure we are not blindly buying into what people say. Hope this helps.
Answer:
A. Asking clarifying questions
Explanation: