What Is the Standard for Determining Guilt in Criminal Cases

What is the standard for determining guilt in criminal cases?

A) Guilt must be proven "beyond a reasonable doubt."
B) Guilt must be proven "beyond any possible doubt whatsoever."
C) Guilt is determined by "the preponderance of the evidence."
D) Guilt is determined by the "standard of reasonableness."
E) Guilt is determined according to different standards based on the severity of the crime.