At approximately what temperature will nuclear reactions begin in the core of a pre-main-sequence star?

Name: At approximately what temperature will nuclear reactions begin in the core of a pre-main-sequence star?
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Nuclear reactions will begin in the core of a pre-main-sequence star at around 5 million K, which is hot enough to overcome the electrostatic repulsion between atomic nuclei and trigger fusion reactions. Options A, B, and C are all too low of temperatures for this to occur.

At Approximately What Temperature Will Nuclear Reactions Begin in the Core