Los actores entran en a. versión original c. escena b. la fila d. pantalla

Entrar en escena is a common phrase and translates into enter the scene and is common when talking about actors and actresses. So the sentence Los actores entran en escena can be translated as The actors enter the scene. Here actores has the masculine plural form, therefore the definite article we must use is los as indicated in the sentence.

lo

explanation: