The correct answer is: B. industry at a growth stage.
A growth industry is one that is experiencing rapid expansion. This can be due to a number of factors, such as new technologies, changing consumer preferences, or government regulations. Growth industries offer investors the potential for high returns, as companies in these industries are often able to grow their profits at a faster rate than the overall economy.
Defensive industries, on the other hand, are those that are less sensitive to changes in the overall economy. These industries tend to be more stable and offer investors a lower level of risk. However, they also offer the potential for lower returns.
Industries in the maturity period are those that have reached a point of stability. These industries are no longer growing as rapidly as they once were, but they are also not declining. They offer investors a balance of risk and return.
Industries with more export potential are those that are able to sell their products or services to customers in other countries. This can be a major source of growth for companies in these industries, as it allows them to tap into a larger market. However, it also exposes them to risks such as changes in exchange rates and political instability.
In conclusion, Mr. A should choose stocks from industries that are at a growth stage. This will give him the best chance of achieving high returns on his investment.