B.The problems of a heart in conflict with itself✓ Correct
C.To be afraid
D.To be fearless
Explanation
The passage explicitly states that 'the young man or woman writing today has forgotten the problems of the human heart in conflict with itself which alone can make good writing because only that is worth writing about'. The author goes on to say 'He must learn them again.' Therefore, what writers must learn again are the problems of the human heart in conflict with itself.
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