With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: At a March 2013 Senate Intelligence Committee hearing, Senator Ron Wyden asked Director of National Intelligence James Clapper, "does the NSA collect any type of data at all on millions or hundreds of millions of Americans?" Clapper replied "No, sir.... Not wittingly. There are cases where they could inadvertently perhaps collect, but not wittingly." This statement came under scrutiny months later, in June 2013, details of the PRISM surveillance program were published, showing that "the NSA apparently can gain access to the servers of nine Internet companies for a wide range of digital data." Wyden said that Clapper had failed to give a "straight answer" in his testimony. Clapper, in response to criticism, said, "I responded in what I thought was the most truthful, or least untruthful manner." Clapper added, "There are honest differences on the semantics of what -- when someone says ‘collection’ to me, that has a specific meaning, which may have a different meaning to him."
text_B: If Clapper's statement is true, would the NSA avoid tapping into a cellphone line of an American citizen who is talking to another American citizen?
YES.