What economic condition in the 1970s led to skepticism about the validity and nature of the Phillips curve?

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A period marked by rising inflation accompanied by decreasing unemploymentAn era characterized by both low inflation and low unemployment ratesA time when both inflation and unemployment rates were elevated simultaneouslyA phase with increasing unemployment rates coupled with declining inflationNone of the above

Explanation

During the 1970s, the economy experienced a unique situation where high inflation coincided with high unemployment, a phenomenon known as stagflation. This challenged the traditional Phillips curve, which suggested an inverse relationship between inflation and unemployment, thereby prompting doubts about its applicability.