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• The correct answer:
গ) My playing days had ended six years before.

- এই বাক্যে "before" adverb হিসেবে কাজ করছে, কারণ এটি "had ended" verb টিকে modify করছে—অর্থাৎ, কাজটি কখন ঘটেছে তা বোঝাচ্ছে।
- তাই প্রদত্ত Sentence টিতে before হলো Adverb.

• Before (adverb)
- English Meaning: at an earlier time; during the period preceding a particular event or time.
- Bangla Meaning: আগে, পূর্বে।

• Other options:
ক) "She had to rest before dinner." → Preposition (introduces the noun "dinner").
- Noun/Noun Phrase (article + noun) এর পূর্বে Preposition বসে।

খ) "She stood before the fire." → Preposition (shows position relative to "the fire").
- Noun Phrase (article + noun = the fire) এর পূর্বে Preposition বসে।

ঘ) "And miles to go before I sleep." → Subordinating Conjunction (introduces the clause "I sleep").
- before এখানে Conjunction কারণ দুইটি clause কে যুক্ত করেছে।

Source:
1. Oxford Dictionary.
2. Merriam-Webster Dictionary.