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Is it possible the friend was sending money out to Hungary or doing anything else that would raise red flags with the lender (i.e., cash advances, rapid balance spike, etc).
I agree with what the other poster mentioned above re/ if the lender suspects money laundering and/ or is in the process of conducting regulatory compliance reviews, even if nothing wrong was actually taking place. Just trying to help you think this through.
Definitely have friend contact BoA to find out more specifics.
Asking us won't determine the answer. There are countless possible reasons. Only the creditor can provide a definitive answer. Your friend should review credit reports. It's not just the one account that matters but one's entire credit profile. However, the issue could have nothing to do with credit and possibly have something to do with other reasons stated above. Again, we can speculate but we can't confirm.