Which of the following is an example of unsystematic risk?

a- Green gas bill will result in an increase of 20% in electric car sale nationally next year

b- Trump announced increasing tariff for importing steel from China.

c- Fed announced a new round of quantitative easing (QE) buying $800 billion of Treasury securities in the next 3 years.

d- Oil price reached a record high, and grocery store prices go up as well