Discussion

Explanation:

The passage mentions that people having a risk allele are vulnerable to problems; the data mentioned in option 1 jumps to a conclusion preposterously and can be eliminated.
Paragraph 4 of the passage states that orchids do well only if provided a certain atmosphere. Thus, the data presented in option 2 will not always be valid.
According to the data presented in paragraph 4, option 3 is valid only for dandelions and not orchids.
As mentioned in the first sentence of the second paragraph, “Researchers have identified … trying experiences later in life”, the data mentioned in option 4 can be affirmed.
Option 5 makes a very strong point, the data for which cannot be inferred from the passage.
Hence, the correct answer is option 4.

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