The officer was not willing to take a definite stand on that point.

Answer: Option B

One word substitute is Evasive.

Vague: of uncertain, indefinite, or unclear character or meaning.
Evasive: tending to avoid commitment or self-revelation, especially by responding only indirectly.
Ambiguous: open to more than one interpretation; not having one obvious meaning.
Complex: consisting of many different and connected parts.