add or remove commas, if necessary, until the sentence has correct punctuation. when the radio station plays…

Brief Explanations:

A comma is needed after the dependent clause "When the radio station plays country music" to separate it from the independent clause "Ernesto de la Cruz sings louder than everyone else." This follows the rule that when a dependent clause (starting with a subordinating conjunction like "when") comes before an independent clause, a comma is used to separate them.

Answer:

When the radio station plays country music, Ernesto de la Cruz sings louder than everyone else.