When a Witness in a Trial Asserts That He or She

When a witness in a trial asserts that he or she is pleading the Fifth Amendment, it means that the person:

A) probably has something to hide from judges and law enforcement.
B) is invoking the guarantee that no citizen shall be compelled in any criminal case to be a witness against oneself.
C) is referencing the Miranda rule.
D) is asking for a grand jury to decide if prosecutor has enough evidence to find a defendant guilty on criminal charges.