All of the people at the AAME conference are —

✅ কেন সঠিক: The subject’s name is ‘mathematics’ (the final s is part of the word), and it modifies the plural noun ‘teachers’, which must agree with ‘all of the people… are’. So: mathematics teachers.

❌ অন্য অপশন: ‘Mathematic’ is not the subject name; an apostrophe is wrong here; ‘teacher’ is singular and does not agree with ‘are’.

💡 মনে রাখুন: Subject names ending in -s keep the s when used as modifiers: a physics lab, economics students, mathematics teachers.