The hints state "dat" means "that" and "those" but "that" is not accepted as a correct answer here. Why?
Because "birds" are plural, and you only use "that" with singular nouns:
- Dat is een vogel. That is a bird.
- Dat zijn vogels. Those are birds.
Het zijn vogels, zij zijn vogels, dat zijn vogels. May I know the difference between thesen
Because dat and dit can be used both as a demonstrative determiner (which means premodifying a noun) or as a demonstrative pronoun (that is, without a noun, since pronouns take the place of nouns).
Dat is een boek. (Pronoun)
Dat boek is duur. (Determiner)
Die and deze, on the other hand, are Detweminers and can never be used as pronouns. Thus, they always premodify a noun, and cannot stand independently as Subject of a sentence.
Die/deze vrouw is mooi. (Determiner)
Hope this helps.
"Those" is the plural of "that". Since you have birds, plural, you need to use "those".