Author ก็แปลว่านักเขียนนะคะ ทำไมผิด
This should really be "He is a writer" rather than "He is one writer".
Oh it's been fixed - thanks!
ใช้ An ปะคะ
I had to choose between "he is a author" and "he is an author". The "correct" choice for Duolingo is "a author" lol