Context: Read the passage and look at the picture.
The Cascade Range is a volcanic arc in the Pacific Northwest that begins in California and runs north into British Columbia. As the North American Plate and the Juan de Fuca Plate move toward each other, oceanic crust of the Juan de Fuca Plate subducts, or sinks, below continental crust of the North American Plate.
There are eighteen volcanoes in the Cascade Range, and some of them are still active. Mount St. Helens is an active volcano near Seattle, Washington. It last erupted in May of 1980.
Complete the sentence.
The Cascade Range formed at a () boundary.
A. divergent
B. transform
C. convergent
From the given choices, pick the correct answer and respond by indicating the letter of the correct option.
Answer: C