medium · Enhanced ACT reading
Consider the following micro-passage and table regarding atmospheric research: 'Researchers tracked the concentration of methane in a sealed chamber over several hours. They noted that catalysts were introduced at the 2-hour mark, which they hypothesized would accelerate the decay rate significantly.'
| Time (hours) | Methane (ppm) |
| :--- | :--- |
| 0 | 450 |
| 1 | 420 |
| 2 | 395 |
| 3 | 310 |
| 4 | 235 |
Based on the table and the text, which of the following best describes the observed impact of the catalysts?
- The catalysts caused the concentration to increase.
- The decay rate nearly tripled after the 2-hour mark.
- The methane level reached zero after four hours.
- The concentration remained stable before the 2-hour mark.
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