Certain flower seeds have a weight of 0.0000000286 ounces. How is this number of ounces written in scientific notation?
A. 2.86 x 10^-7
B. 2.86 x 10^7
C. 2.86 x 10^8
D. 2.86 x 10^-8
A. 2.86 x 10^-7
B. 2.86 x 10^7
C. 2.86 x 10^8
D. 2.86 x 10^-8