<u>Answer:</u>
<em>D. Shackleton would get another chance to achieve his goal, but it wouldn’t be for another eight years.
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<em></em>
<u>Explanation:</u>}
When concluding a given subject, some approaches should be considered to make sure your conclusion is viable. However, professional writing, writers have to remember that it is crucial to have more attention in the outcome because it gives the reader a summary of what has been discussed entirely.
Therefore a valid conclusion should correspond to the essay, should not have loose ends, or it should not be unorganized. Thus including a well structured conclusion in your writing is crucial.
The linking verb is "could have"
