How Is Intent in a Murder in the Second Degree

How is intent in a murder in the second degree trial most often determined?

A) Most often proven with direct evidence
B) Seldom from the nature of the act and from all the circumstances of the case in evidence
C) Seldom by direct evidence, but most often through deduction or inference by the trier of fact from the character of the assault
D) The nature of the act and consideration of all the circumstances of the case in evidence