Light yogurt sales in the United States have been declining eight percent per year since 2016 due to younger consumers choosing to switch to Greek yogurt. In 2016, distributors had $1.2 billion in light yogurt sales. Which equation could be used to represent light yogurt sales (in billions of dollars) in the U.S. 't' years after 2016? *
a. y= 1.2(0.92)^t
b. y= 1.2 (8)^t
c y= 1.2(0.08)^t
d. y=1.2(1.08)^t