Question

choose the correct way to connect the two complete thoughts. edna krabappel sings loudly her neighbors don’t mind.

Explanation:

To connect two complete thoughts, a coordinating conjunction or a semicolon can be used. In this case, since the two thoughts "Edna Krabappel sings loudly" and "her neighbors don't mind" are contrasting, the conjunction "but" is appropriate.

Answer:

Edna Krabappel sings loudly but her neighbors don't mind.