Concept:Uncountable nouns do not have a plural form.Explanation:Safety is an uncountable noun. It refers to a state or condition, not a countable object. Therefore, it has no plural form.Effort can be both countable and uncountable, but in general usage, it has a plural: efforts.Daisy is a countable noun; its plural is daisies.Necklace is a countable noun; its plural is necklaces.Thus, only "Safety" has no plural form.Answer:Option A: Safety