What is the plural form of 'Mr'?

Correct answer: Messrs.

Mr (noun)
- English meaning: used as a conventional title of courtesy except when usage requires the substitution of a title of rank or an honorific or professional title before a man's surname.
- Bangla meaning: পুরুষের নামের আগে যুক্ত খেতাব; জনাব; শ্রী ইত্যাদি।
- Plural form- Messrs (Messieurs-এর সংক্ষিপ্ত রূপ).

Other options:
ক) Mrs.
- used as part of the title for a married woman who has won a contest.

খ) Ms.
- used as a conventional title of courtesy before a woman's surname.
- used instead of Miss or Mrs.

গ) Miss
- used as a title prefixed to the name of an unmarried woman or girl, or one who uses her maiden name.

Source:
1. Accessible Dictionary by Bangla Academy.
2. Merriam-Webster Dictionary.