The instrument played in the excerpt from Prolofiev's Peter and the Wolf : 18 is Clarinet. Clarinet is single-reed woodwind instrument used orchestrally. It is consist of a closed cylindrical air column with a bell-shaped opening at one end. The mouthpiece holds a single reed, in contrast to the double reed of the oboe family. It is typically constructed of wood.
Since this is the bass clef,
•G is on the bottom line,
•E is on the 2nd space and
•D is on the middle line.
It spells GED and I don't think that's a word but oh well ¯\_(ツ)_/¯
I hope I helped!