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• A synonym of the word 'crepuscular' is- twilit.

• Crepuscular (adjective)
- English Meaning: of, relating to, or resembling twilight: dim; relating to or like the time of day just before the sun goes down.
- Bangla Meaning: (আনুষ্ঠানিক) গোধূলিকালীন।

• Given options:
ক) nocturnal (adjective)
- নৈশ; নিশাচর: (active at night) nocturnal birds; a man of nocturnal habits.

খ) diurnal (adjective)
- (আনুষ্ঠানিক) আহ্নিক (যেমন আহ্নিক গতি): (active during the day) diurnal motion of the sun; একদিনব্যাপী; ঐকাহিক।

গ) cathemeral (adjective)
- It means active at irregular times (any time of day/night, not specifically twilight; a different biological term).
- Neither pre-scriptively nocturnal, nor diurnal, nor crepuscular, but irregularly active at any time of night or day, according to prevailing circumstances.

ঘ) twilit (adjective)
- আধোআলোকিত।

• সুতরাং, অপশনের অর্থ বিবেচনা করে দেখা যায় যে, A synonym of the word 'crepuscular' is- twilit.

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