The theory of cause and effect explains many mysteries of the universe.
Explanation:
- Concept: This noun refers to an abstract or generalized idea. While related to theories, "cause and effect" is a specific concept that is being discussed in the sentence.
- Effect: This noun refers to a result or consequence of an action or event. In the context of the sentence, it fits well as it is the other half of the "cause and effect" relationship being mentioned.
- Affect: This verb refers to having an influence on something. It is not a suitable noun to complete the sentence.
- Reasons: This noun refers to explanations or justifications for actions or beliefs. While related to theories, "cause and effect" is a specific concept that is more appropriate in this context.
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