The noun form of 'preventable' is:

Correct option is A

 'Preventable' is an adjective; its noun form is 'prevention', which means the act of stopping something from happening.

• (B) Preventive: While "preventive" is an adjective meaning relating to prevention, it's not the noun form of "preventable". 

• (C) Prevent: "Prevent" is the verb form of "preventable". 

• (D) Prevented: "Prevented" is the past tense of the verb "prevent". It describes something that has already been stopped, not the act of stopping itself.