The most accurate response regarding the changes in early warning systems for volcanic eruptions since the eruption of Mount St. Helens in 1980 is:
There are more and better instruments for monitoring volcanoes, and scientists are able to identify eruptions earlier and more accurately than before.
Advancements in technology and monitoring techniques have significantly improved the ability to predict volcanic eruptions, allowing scientists to analyze seismic activity, gas emissions, ground deformation, and thermal activity with greater precision.