"It is French."
Translation:Il est français.
It can with the personal pronoun "elle": "elle est française".
It cannot if you have used "il" or "c'" to translate "it", since both are masculine.
Reminder: you are not addressing anybody else than the other learners on this forum, and none of us can see which exercise you had to do, nor the answer you gave, nor the computer-checker's response.
okay...as i said before"thanks for the advice"or french"Merci pour le conseil'