Is asexual reproduction better when the environment changes or when the environment does not change?

Asexual reproduction produces genetically identical offspring and sexual reproduction creates variation in the offspring. When the environment changes and it affects the asexual offspring it will affect all identical copies whereas since the sexual offspring have more variation, they are more likely to survive.

When plants die fungi breaks them down

Since we don't see a strand; i got answers off a sheet and the correct answer is "2".