Meaning of underlined phrase:
"The master is a man of letters."

• Correct Answer: Scholar.

• A man of letters :
English Meaning: a male scholar or author.
Bangla Meaning: পণ্ডিত/বিদ্বান/লেখক
Example Sentence: Dr. Shahidullah was a man of letters.

Other options:
• A snake in the grass:
English Meaning: an unpleasant person who cannot be trusted, a secretly faithless friend.
Bangla Meaning: ১. যাকে বিশ্বাস করা যায় না, অবিশ্বস্ত বন্ধু।

• A man of straw:
English Meaning: someone who has a weak character.
Bangla Meaning: দুর্বল চিত্তের বা চরিত্রের লোক।

• A man of many parts/A man of parts:
English Meaning: a man with great ability in many different areas.
Bangla Meaning: অত্যন্ত দক্ষ/মেধাবী

Source: Merriam-Webster Dictionary, Accessible Dictionary, Website lecture.