"The apple of Anna is red."
Translation:Mărul Anei este roșu.
This sentence seems to have two correct answers: "Mărul Anei este roșu" and "Mărul lui Anna este roșu".
Is there any difference between them? As far as I know, whenever a noun or a personal name ends in -a, it must change to -ei rather than follow the "lui [Nominative]" form.
This is incorrect! This is a popular expression, correct expression is:
Mărul Anei este roșu .
If you select on of the 3 options The only way to respond correctly is to choose :
Mărul lui Anna este roșu..
It would mean that Anna is a boy or you are in the street and speak local popular language.