In the Facts of the Previous Question,under the Dissent's Reasoning

In the facts of the previous question,under the dissent's reasoning in United States v.Bhagat,the "office abuzz" reference is

A) proper to amend Elron's indictment.
B) proper to impeach Elron's testimony.
C) proper to provide a jury with a basis to infer what Elron knew.
D) not proper.