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Multiple Choice: Identify the MOST appropriate NEGATIVE closing for a formal letter declining an invitation to a business conference:

"Regretfully, I will not be able to attend. Please let me know if there are any recordings available."

"I am afraid I won't be able to make it$.$ Best wishes for a successful event."

"Due to unavoidable circumstances, I must decline your kind invitation."

"Thank you for the opportunity. I hope to attend another event in the future."

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