ক. Do you know how often the buses ran?
খ. Do you know how often the buses run? ✔
গ. Do you know how often do the buses run?
ঘ. Do you know how often did the buses run?
ব্যাখ্যা: Main clause-টি 'Do you know' (Present indefinite) হওয়ায় Embedded question-এ 'how often' এর পর Subject (the buses) + Present verb (run) বসে Assertive structure গঠন করে।
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