Final answer:
The piano begins with an Adagio musical passage, which is played slowly and gracefully to create a peaceful and lyrical mood.
Step-by-step explanation:
Based on the given options, the type of musical passage that the piano begins in this selection is Adagio. Adagio is a tempo marking in music that means the passage should be played slowly and gracefully. This tempo creates a peaceful and lyrical mood in the music, allowing the pianist to express emotion and sensitivity.