Southern plantation owners in the colonial era could not depend on using indentured servants for labor because (2 Points)
there was no reason for them to come to the colonies.
there was an uncertain supply of workers.
the workers knew they would never be free.
the workers would not be able to become property owners.

there was an uncertain supply of workers

Explanation:

The plantation economy blossomed in Southern America and because of this, Southern plantation owners were in need of more laborers. They resorted to "indentured servants." These servants were tied to help in the plantation for 5 to 7 years and after which, they'd already be set free. In exchange, they'd be given shelter, food and clothing. However, most of the servants didn't survive long enough to complete their contract. Many died because of diseases while others suffered under very cruel masters. It was also hard to form families because of a huge ratio gap between men and women. This decreased the population of the indentured servants and created an uncertain supply of workers.

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