The phrase 'As cool as a cucumber' means to -

- প্রদত্ত প্রশ্নের As cool as a cucumber এর সঠিক উত্তর হচ্ছে Very calm and controlled.

As cool as a cucumber
English Meaning: very calm and controlled.
Bangla Meaning: শান্ত এবং ধীরস্থির।
Ex. Sentence: My boss is as cool as a cucumber even when he speaks in front of hundreds of people.
Bangla Meaning: আমার তত্ত্বাবধায়ক / বস শত শত লোকের সামনে কথা বলার সময়ও শান্ত এবং ধীরস্থির থাকেন।

Others Option & Meaning:
• Very nearly / almost / nearly is the meaning of As good as.
• Almost but not quite / even though / almost is the meaning of As much as.

Source: Lecture.