Question

why do governments regulate natural monopolies?
to allow additional producers to enter a market
to prevent a monopoly from abusing its customers
to help lower the costs of production or distribution
to provide companies with greater access to raw materials

Explanation:

Natural monopolies have significant market - power. Without regulation, they may charge high prices and provide poor service, thus abusing customers. Governments regulate them mainly to protect consumers.

Answer:

to prevent a monopoly from abusing its customers