Far from being a ______ act, the ambassador's seemingly innocuous comment during the diplomatic summit was a calculated maneuver intended to provoke a specific response.

✓ Correct Answer: Option A

The phrase 'Far from being a X act...was a calculated maneuver' indicates that the blank must be the opposite of 'calculated.' 'Spontaneous' means unplanned or impulsive, which is the antonym of calculated.