Bonjour
Les yeux de mon ami sont bleus.
But you could also say "Les yeux de mon ami sont gris" as "gris" ends with an "S" in singular and plural form ....
A- vert = should be "verts"
B- bleu = should be "bleus"
C- bleus = CORRECT
D- gris is also correct
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hope this helps ☺☺☺
