Correct answer: A. Two plates coming together
Explanation: A convergent boundary is a plate boundary where two tectonic plates move toward one another. Their movement may lead to collision, subduction, mountain building, trenches, earthquakes, or volcanic activity, depending on the types of plates involved. The basic event described by the term “convergent” is therefore two plates coming together. Option A is correct.
The word convergence means moving toward a common point or becoming closer. This is the opposite of divergence, in which plates move apart. Wind blowing and a change in ocean colour are not defining movements of tectonic plates. “Always moving apart” directly describes a divergent boundary and contradicts the meaning of convergent. Thus, even though several geological effects can occur at such boundaries, the simplest and most direct answer is that two plates come together.