Final answer:
The prior inconsistent statements are admissible for impeachment only if made under oath.
Step-by-step explanation:
Prior inconsistent statements are admissible to impeach the person who made them. However, they are not always admissible for impeachment. The correct answer is (b) Admissible only if made under oath.
Under the Sixth Amendment, witnesses presented in a criminal trial must generally testify in a courtroom and be subject to cross-examination. Hearsay, or testimony by one person about what another person has said, is generally inadmissible, but there are exceptions. One exception is when a prior inconsistent statement is made under oath, such as during a deposition or in a sworn affidavit.