Context: Read the passage and look at the picture.
The Kuril Islands are part of a volcanic arc that begins near northern Japan and runs north toward Russia’s Kamchatka Peninsula. The islands trace a tectonic boundary where the Pacific Plate moves toward and subducts, or sinks, below the Okhotsk Plate.
Volcanoes in the Kuril Islands are still active. On June 12, 2009, the Sarychev Volcano erupted just as the International Space Station was orbiting over the Kuril Islands. The astronauts aboard the space station were treated to a stunning view of the eruption.
Complete the sentence.
The Kuril Islands formed at a () boundary.
A. convergent
B. divergent
C. transform
Identify the correct choice from the options below and respond with the letter of the correct option.

A