Right Answer:
Masculine Singular:
Il est indien. (He is Indian.)
Feminine Singular:
Elle est indienne. (She is Indian.)
Masculine Plural:
Ils sont indiens. (They are Indian.) [when referring to a group of males or mixed gender group]
Les hommes sont indiens. (The men are Indian.)
Feminine Plural:
Elles sont indiennes. (They are Indian.) [when referring to a group of females]
Les femmes sont indiennes. (The women are Indian.)