A problem that is not caused by monopolies is More competition.Thus the correct answer is D.
<h3>What is a monopoly?</h3>
A monopoly refers to a situation when the market of particular goods and services is captured by a single entity or owner and restricts entry by controlling the activities.
They aim at limiting the amount produced for the market, which leads to charging more. This results in cutting back on economic welfare and consumer surplus.
As they are the single seller in the market which shows that there is no competition in the market, who challenges them. The problem of more competition is not caused by monopoly.
Therefore, Option D is appropriate.
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