Answer:
The wistful nature of the man's final thoughts illustrate the human cost of the gold rush.
Explanation:
An objective statement is the one not influenced by personal feelings or opinions.
The first detail is not objective as it contains a personal opinion about descriptive writing (... <em>is an </em><em><u>excellent</u></em><em> example of.</em>..).
The second detail tells about the narrator's personal feelings (<em>I was </em><u><em>heartbroken</em></u><em>...</em>).
The third detail contains another personal opinion, this time about London's narrative abilities (<em>London is </em><u><em>masterful</em></u>...).
The only detail that is stated like a certain fact that no one could have a different opinion or feelings about is the last one: <em>The wistful nature of the man's final thoughts illustrate the human cost of the gold rush.</em>
