Correct answer: Dio
Complete sentence: Ella le (dio) un regalo.
Which translates to: She gave them a gift.
For this case, we will translate the sentence part by part.
the coach (masculine): El entrenador
interviews: entrevista
the athlete (masculine): a el atleta
In Spanish the word "el" serves to differentiate the word "atleta" from the masculine or feminine gender.
Answer:
You have to say:
El entrenador entrevista a el atleta.