From reading this passage, we infer the following:

Question

Sadako and her family survive the bombing of Hiroshima, but a few years later she becomes ill. It is then determined that she has the bomb disease, radiation poisoning. The true story, published by Eleanor Coerr, recounts Sadako’s days in the hospital where she folds paper cranes as she fights the deadly disease of leukemia. She comes close to her goal of folding one thousand. Upon her death, Sadako’s classmates fold the rest to total one thousand.

From reading this passage, we infer the following:
Question 4 options:

1) Sadako’s parents are bitter

2) Sadako’s parents are dead

3) Sadako believed she could fight the disease if she folded one thousand paper cranes.

4) Sadako lived until the last paper crane was folded.

Answer 1

We know from the first sentence that Sadako and her family survive, so we can rule out answer #2.

Second to last sentence tells us she died before getting to 1,000, so we can rule out #4.

Sadako's parents aren't mentioned, so while #1 is an option it would be reading a lot into it. You couldn't prove it with the passage that's provided.

The third sentence says she's folding cranes while she fights a deadly disease. This makes #3 a much more logical answer than #1, more easily backed up by the passage.

Answer 2

The answer is #3. Eliminate answers one and two immediately because they have nothing to do with the passage. According to the passage, the 4th answer is not true, because she did die before the one thousand cranes were folded. That leaves answer three. Ask yourself why did Sadako fold paper cranes? Perhaps she thought folding the cranes was like praying or that her purpose of folding the cranes would keep her alive until she achieved her goal.