Bonjour
Answer C ► Marie aide son frère.
frère = masc. sing
son = possessive adjective masc. sing.
In French the possessive adjective agrees with what is possessed.
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a- Marie aide sa frère => "sa" is false
b- Marie peint son frère => doesn't make sense : Marie paints her brother
C- Marie aide son frère. Marie helps her brother ==> CORRECT
d- Marie aime sa frère ==> "sa" is false
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hope this helps ☺☺☺