Otto, age 81, just relayed a news story to his friends over coffee, but cannot remember where he heard or read about the tale. otto has

source amnesia

Explanation:

According to my research on Neurological disorders/diseases, based on the description of what is going on with Otto, I can say that he has source amnesia. This term is defined as the inability to remember where, when or how previously learned information has been acquired, while retaining what is learned.

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answer (c) by causing social withdrawal;