The most accurate impact of the Three Mile Island accident in Pennsylvania is:
c) the accident caused radioactive gases to be released into the atmosphere.
The incident, which occurred on March 28, 1979, was a partial meltdown of one of the reactors, and while it did not result in immediate deaths or long-term health effects that were measurable, there were concerns about the release of radioactive gases. The accident also led to increased scrutiny of the nuclear industry, significant regulatory changes, and a decline in public support for nuclear power in the U.S.