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The correct answer is Option B:
The illusion of control can lead investors to inadequately diversify portfolios. Researchers have found that some investors prefer to invest in companies that they may feel they have some control over, like the companies they work for, leading them to hold concentrated positions.
Confirmation bias may also lead to under-diversify portfolio and/or holding a disproportionate amount of their investment assets in their employing company’s stock because they believe in their company and are convinced of its favorable prospects.