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Topic: বানান শুদ্ধিকরণ, Subject: Bangla Bengali literature (বাংলা সাহিত্য)

Best Answer Explained in Below-:

The question asks for the correct spelling of the word that denotes a recurring or frequent occurrence. Among the options given, "মুহুর্মুহু" (C) is the only correctly spelled version of the term.

In Bangla, the word "মুহুর্মুহু" is derived from the combination of "মুহূ" which signifies 'moment' or 'time' and it is used as an adverb to indicate something happening repeatedly or in quick succession. The usage of the letter 'ঁ' in "মুহুর্মুহু" is essential as it transforms the pronunciation and meaning effectively.

Let’s examine the other options:
- A) "মূহুর্মুহু" has an incorrect placement of the vowel 'ূ', which is not used in the standard form.
- B) "মুহুমূর্হু" introduces additional phonetic elements that distort the actual term.
- D) "মুর্হুর্মুহু" also deviates from the authentic structure by altering essential vowel sounds.

Thus, "মুহুর্মুহু" (C) stands out as the only option that adheres to the conventional spelling rules of Bangla, ensuring accurate meaning and pronunciation. It reflects proper linguistic usage, making it the correct answer to the question.