Based on the information and table, which statement is the best conclusion?

The results of a study of an experimental drug treatment seem to suggest that it is quite effective in treating an eye disease. The table below indicates the results of the use of the experimental drug therapy on 500 males who are 40C60 years old.

Based on the information and table, which statement is the best conclusion?
A . Most of the human subjects in the study would have had a natural reversal of the symptoms even if they were not treated.
B . The strong recovery rate of human subjects treated with established drug therapy makes the experimental drug therapy unnecessary.
C . The experimental drug therapy shows promise, but it needs to be tested much more fully.
D . The experimental drug therapy can now be used with any patient who has this disease.
E . Similar results would have been obtained from a study of females in the same age group.

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Answer: C