Multiple Choice Question

Consider this paragraph. Then, answer the question.

It is easy to become discouraged when considering the world's many environmental problems, but do not lose track of the single most important conclusion that emerges from our examination of these problems$-$the fact that each is solvable. A polluted lake can be cleaned; a dirty smokestack can be altered to remove noxious gas; waste of key resources can be stopped.

Source: Johnson, George. Essentials of the Living World. $4$th ed$.,$ WCB$-$McGraw, $2013.$

Based on the context clues in the paragraph, the best definition for "noxious" is

purified

excess

unexpected

harmful

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