Although Federal District Courts Are Theoretically Bound by Supreme Court

Although federal district courts are theoretically bound by Supreme Court precedents,they sometimes deviate because

A) the facts of a case are seldom precisely the same as those of similar cases decided by the Supreme Court.
B) federal judges may decide a different legal reasoning is justified.
C) ambiguities or unaddressed issues in Supreme Court rulings give lower courts some flexibility in deciding cases.
D) of all these factors: The facts of a case are seldom precisely the same as those of similar cases decided by the Supreme Court; federal judges may a different legal reasoning is justified; and ambiguities or unaddressed issues in the Court's rulings give lower courts some flexibility in deciding cases.
E) None of these answers is correct.