Correct option is C
Option (c) contains an error.
The error lies in the use of the word “effected.” The correct word should be “affected.”
Grammatical rule used:
"Effect" is usually a noun, meaning result/outcome. "Affect" is a verb, meaning to influence or change something.
In this sentence, the verb form is required because we are talking about the action of influencing the environment.
Correct sentence: "The radiation leak from the nuclear accident at Chernobyl affected the environment and the surroundings irreparably."
Example: The war affected the entire nation badly.
Information Booster:
Effect as a verb means to bring about (e.g., effect change), which is rare.
Affect is almost always a verb in regular contexts.