Investors should not rely on the predictions of stockbrokers who publicly predict trends in the stock market. If these stockbrokers were really able to predict these trends accurately and wished to profit as much as possible from their own predictions, they would keep this information to themselves.

Which of the following, if true, most strongly supports the argument above?


A. The greater the accuracy of a stockbroker's past predictions about stock-market trends, the more likely it is that investors will believe the stockbroker's future predictions.
-incorrect

B. Some investors who pay stockbrokers for confidential information about trends in the stock market nevertheless decide to follow their own predictions about these trends
= incorrect as can't be inferred from the passage

C. Most stockbrokers have high enough salaries to live comfortably and thus do not care about getting rich by capitalizing on stock-market trends.
-irelevant

D. The fewer investors who have access to accurate stock market predictions, the more money those who have access to such predictions can make.
-correct as it supports the argument .if everyone knows the future,no profit can be made

E. Because the stock market is unstable, investors unfamiliar with stock-market trading practices have great difficulty predicting trends in the stock market.
-incorrect