Sarah Is a Self-Proclaimed Agnostic

Sarah is a self-proclaimed agnostic. Which of the following is true about her ability to testify in a criminal proceeding?

A) Under common law, Sarah would be disqualified from testifying based on her religious philosophy.
B) Sarah would be prohibited from testifying under U.S. law as prohibiting people from testifying based solely on their religious beliefs is in the interest of society and is consistent with American democracy.
C) Sarah would be permitted to testify so long as she took the oath to testify truthfully.
D) Sarah could object to testifying based her First Amendment right of Freedom of Religion.