Historian: "The Recent Work by a Renowned Historian on the Civil

Historian: "The recent work by a renowned historian on the civil war in Nicaragua is not a reliable account of the war. The historian relies on many interviews from anonymous sources, and anonymous sources are often fabricated. Clearly the work is not to be trusted."
Which of the following, if true, would most weaken the historian's argument?

A) The work in question used anonymous sources to protect interviewees from possible retaliation for telling their stories.
B) A recent study showed that oral interviews are as reliable as written sources.
C) Anonymous sources are more likely to embellish claims.
D) Anonymous sources can be trusted, but only if their stories can be verified by multiple accounts.
E) Many historical accounts that relied on oral interviews have been revolutionary in the field.