In Eating Behaviour article a certain referencing style is used. With respect to this method, which statement below is correct?

Question $8$Select one:

a$.$

They are using a referencing style that is normally not accepted in good scientific journals,$$

b$.$

They use a numerical system where the references are listed in order of use within the article.$$

c$.$

They are using footnotes as a referencing style.$$

d$.$

They use a numerical system where the references are listed in alphabetical order.