write down what you think is a rule that could explain what makes a sentence grammatically correct or not

Read each sentence carefully and select the option with the sentence written correctly. la chica necesita el falda rojo. la chica necesita la falda roja. la chica necesita los faldas rojas. la chica necesita las faldas rojos.

Ive been trying to figure this out for a week now , you basically explain how to get to each place (bottom right) starting from starting point , pls i need 1-10 by monday

Units for measuring liquid capacity