The ratio of investment in 1997 to the average investment is:

Answer: Option A

Average investment
= $$\frac{31.36+24.23+10.22+20.16+10.15+5.7}{6}$$
= $$\frac{101.82}{6}$$
= 16.97
Then ratio of average investment to year 1997
$$\begin{array}{rl}& =\frac{31.36}{16.97}\\ & \approx \frac{2}{1}\\ & =2:1\end{array}$$