The correct option is A Creeping Inflation
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Walking inflation occurs when prices rise moderately and annual inflation rate is in single digits. Inflation of this rate is a warning signal for the government to control it before it turns into running inflation.
Creeping inflation is a condition where the inflation in a country increases slowly but continuously over a period of time and the effect of inflation is noticed after a long period of time. For example, if the inflation is at the rate of 3% it will take 33 years for the prices to double.
Structural inflation arises due to structural weakness like infrastructural bottlenecks in the economy.