Choose the Correct spelling-

The correct spelling is- খ) Etiquette.

Etiquette (noun)
- Bangla meaning: বিশেষ পেশায় বা সমাজের বিশেষ স্তরে প্রচলিত আদবকায়দা; নম্র আচরণ
- English meaning: the conduct or procedure required by good breeding or prescribed by authority to be observed in social or official life.

Example sentence:
1. Her failure to respond was a breach of etiquette.
2. He showed his contempt for social etiquette by not wearing a tie.

Source:
1. Merriam-Webster dictionary
2. Accessible Dictionary
3. Cambridge Dictionary