How Do Fragile Structures Like Acetaldehyde (CH₃CHO) Molecules Survive in the Harsh

How do fragile structures like acetaldehyde (CH₃CHO) molecules survive in the harsh environment of interstellar space? Why are they not destroyed by high-energy radiation from stars?

A) such molecules are only found in the shadows of the stars
B) such molecules are found only on planets or comets, not in space
C) such molecules are protected by the presence of hot interstellar hydrogen
D) such molecules are found only in dense clouds that have a lot of dust; the dust keeps the radiation from hot stars from reaching the molecules
E) such molecules are found only where very cool stars are present, that's why they are so very rare in the Galaxy
Section 20.3: Interstellar Dust