Which of the following explains why impeaching one's own witness was prohibited under common law?

Question

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Under common law, impeaching one's own witness was prohibited because it was based on the principle that the party calling the witness was affirming the witness's credibility and character, and it was deemed unfair or foul play to then attack the credibility of that witness. This reflects both the theoretical underpinning of vouching for a witness's credibility (A) and the notion that it was considered improper conduct to then impeach that witness's credibility (C).

Which of the Following Explains Why Impeaching One's Own Witness