Because when the price of oil higher. Production costs would increase. As a result, goods and services in the system, with higher prices and higher rates when it could be an inflation problem.
When oil prices rise Production costs would rise. The goods and services in a system with a higher price. When prices rise, it may become a problem of inflation.
When oil prices rise. The production cost is increased. Result in goods and services in the system is higher. And when the price increase, it may have become the problem of inflation.