<em /><u><em>"She did not understand what happened."
</em></u>It is a complete sentence since it has a subject (she) and a verb (understand), and is independent (i.e. doesn't require another clause to make sense<u><em>
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The answer is A. how do the parts of the text relate to the whole?
Personality tests are useful because they show individual strengths that enable professionals to determine where their talents are best served. When individuals have a greater knowledge of their personality, they can discover careers and places that match their personality.