Question

which prefix denotes 1/1,000,000,000?
milli-
deci-
micro-
nano-

Explanation:

The prefix "nano -" denotes $10^{-9}$ which is $\frac{1}{1,000,000,000}$. "milli -" denotes $10^{-3}$, "deci -" denotes $10^{-1}$, and "micro -" denotes $10^{-6}$.

Answer:

D. nano-