Which of the following is a secondary reinforcer?
food
sex
a gold star
water
cupcake

Option-(C): The secondary reinforcer can be termed as a gold star.

Explanation:

The professionals and more over the research workers have identified the different requirements for each living being. And for that the first or priority of the living being is considered to be the primary reinforcer in terms of having more significance to the living being presence inside the environment. As there are different level of stimulus for attracting the living beings to itself, along with that the stimulus either on the outside of the living body or the inside much significance to pull the living organism to itself.

protist eukaryotes that are not plants, animals, or fungi ("misfits")

i think that it is plants