After each of the following sentences, a list of possible interpretations of the sentence is given. Choose the interpretation that you consider most appropriate for each sentence.
He said he was a master of electronics, but I knew he was talking through his hat. This means that I knew he was

• A.relying on some else's ideas
• B.merely relying on what he had studied
• C.talking very modestly
• D.claiming what he knew nothing about