What's Emest Hemingway's "iceberg" analogy?

What's Emest Hemingway's "iceberg" analogy?
【正确答案】：Good! literary writing should be able to
A.make readers feel the emotion of the characters directly;
B.the best way to produce the effect is to set down exactly every particulac kind of feeling without any authorial comments, without conventionally emotive language,
C.and with a bare minimum of adj. and adv.