Chemicals that can only be used by licensed pest control operators are considered to be pesticides
A pesticide is used to control the activities of some pests which are considered harmful to the environment. When a pesticide is used properly, it can be used to eliminate pests and keep the environment secure.
There are different types of pesticide which include:
Insecticide
Herbicide
Rodenticide
Fungicides, etc
Therefore, the correct answer is pesticide because they are used to control pests.
It's not 1-propanone because otherwise you have OH bonded to C not O and H bonded to C separately. 2-butanol means that the O and H would be bonded to a different C atom, and it's not propyl hydrogen ether because the O would be in the chain of bonded Cs. Hope this helps :)