The number of years during which the company has its production less than the average production during 1920 - 1927 is approximately.

Answer: Option B

The average production during (1920 - 1927)
$$\frac{71.30+43.51+67.66+76.23+77.23+88.93+91.75+100.17}{8}$$
= 77.0975 (million tons)
The required number of year
= 4 (1920, 1921, 1922, 1923)