Despite the Fifth Amendment's Ban on Self-Incrimination, a Witness Can

Despite the Fifth Amendment's ban on self-incrimination, a witness can be compelled to testify against himself under which of the following circumstances?

A) if accused of treason
B) when there is a clear and present danger to the public if the defendant refused to testify
C) if granted immunity from prosecution
D) when prosecuted by the federal government for a state crime