Which plural noun is incorrectly spelled? geese fungi indexes formuli

Geese, fungi and indexes are all correctly written plural nouns. The incorrectly spelled plural noun is the word "formuli". It should either be formulas, or formulae as the plural noun for the word formula. Formulae is from its original Latin word. 

The answer would be d) the new managers of smalltown grocery store have become unpopular.

Animal farm is a story adout animals that start a rebellion but the animals start to live like their owns the oppressors which is being compared to a hard working time and the poor is geting paid less then the rich that brings alot in the book animal farm