The correct answer is Option (1) → Irregular
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Sporadic means occurring at irregular intervals or only in a few places; scattered or isolated.
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Irregular means not even or balanced in shape or arrangement; occurring at uneven or varying rates or intervals.
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Consistent: Acting or done in the same way over time, or regular. (This is an antonym.)
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Confident: Feeling or showing certainty about something. (Unrelated.)
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Obscure: Not discovered or known about; uncertain. (Unrelated to timing or frequency.)
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