Read the passage below before answering the question.
Two Volcanoes
(1) Mount Hood and Mount Mazama are two of Oregon's most famous volcanoes, but they differ in important ways. Mount Hood stands tall today, its snowy peak visible from Portland on clear days. Mount Mazama, by contrast, erupted so violently about 7,700 years ago that its peak collapsed, creating the basin now known as Crater Lake.
(2) Both volcanoes began as stratovolcanoes, built layer by layer from repeated eruptions of ash and lava. However, Mount Hood remains dormant, while Mount Mazama's major eruption ended its active phase and left behind a deep, water-filled caldera.
Which structural pattern does the passage use?
- ACompare and contrast, highlighting similarities and differences between two volcanoes
- BChronological order, describing events in the order they happened
- CProblem and solution, presenting a danger and how it was solved
- DCause and effect, explaining why volcanoes erupt