Constructive interference occurs when which of the following occurs?
A. Two interfering waves have a displacement in opposite directions.
B. The trough of a wave interferes with the crest of a second wave.
C. The crest of a wave interferes with the crest of a second wave.
D. At the point where there are nodes of standing waves.

Answertraveling around a circular trackexplanation"traveling around a circular track" is the best answer as you could be traveling around a circular track at a constant speed. your velocity would therefore have the same magnitude but will always be constantly direction. since acceleration is the rate of change of velocity, the rate of change will only involve the direction of velocity and not the magnitude.wrong choices: "an object at rest" does not accelerate at all"increasing speed while traveling around a curve" means that the acceleration will not be constant due to only change in direction; it will be constant due to both magnitude and direction"an object in free fall" does not necessarily change direction 

Ithink the answer is fusion