Final answer:
In Mozart's 'Eine kleine Nachtmusik', the instruments you hear are strings, the meter is 4/4, and the accompaniment in the opening minuet is played staccato. The melody in the trio section is more lyrical.
Step-by-step explanation:
The instruments you can hear in Mozart's 'Eine kleine Nachtmusik' are a) Strings. This piece is written for a string quartet, which consists of two violins, a viola, and a cello.
The meter throughout the piece is a) 4/4. This means that there are four beats in a measure, with a quarter note receiving one beat. The piece has a consistent and regular rhythm.
The accompaniment in the opening minuet is played b) Staccato. This means the notes are played short and detached, creating a light and playful effect.
The melody in the trio section contrasts with the minuet as it is d) more lyrical. It has a softer, more expressive quality compared to the lively and dance-like minuet.