Question

correct text in the passage.
in the text best refines the idea that the theremin is challenging to play?

the theremin
is one of the earliest electronic musical instruments and is played without any form of physical contact between the musica
the russian physicist leon theremin invented this instrument in 1920, and he exhibited his innovation all over the world th
al appearance and consists of two metal antennas. the upright antenna controls the pitch, and the loop antenna controls t
moves his hands over the antennas to create electrical signals,, which are magnified through the instrument and relayed
the theremin sounds ethereal and transports the listener to another world.
nt became very popular in the 1930s, but it soon faded into obscurity due to a lack of interest. however, it was revived in
, it has been featured in the soundtracks of many movies. many composers have created musical symphonies that showc
of the theremin. it is one of the most difficult instruments to master because even a proficient player requires a lot of prac
of the musical notes. today, many enthusiasts also build theremins as a hobby using building kits available online.

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Explanation:

The passage states the theremin is hard to master, and the specific detail that supports its difficulty is the line noting even skilled players need extensive practice to hit the correct musical notes.

Answer:

"It is one of the most difficult instruments to master because even a proficient player requires a lot of practice [to hit] the musical notes."