Most countries dont need "justification" for joining a war, typically the only justification is a decision backing up allies, and under this definition, the US was justified, Japan had also initiated aggression againts the US, giving the US an incentive to join the war, so yes, its likely that they were justified in joining the war, for several reasons
The answer to this question is "The New Kingdom"
The answer would be D) intentional, on purpose because that’s the definition of deliberate
