Question

(9) historical data also support these findings. (10) historians have uncovered documents dating back to ancient times that refer to a \first sleep\ and \second sleep.\ (11) rather than view waking in the middle of the night as a nuisance, people appear to have welcomed it as natural, useful, and even enjoyable.
(12) by the end of the 1700s, street lighting in cities became more common, people stayed up later, and writers mentioning first and second sleep less and less. (13) most people seem to have adapted to consolidated sleep, even if they do not get a full eight hours each night. (14) however, researchers argue that some modern sleep disorders such as insomnia may be the result of enforcing an unnatural sleep rhythm. (15) in other words, waking in the middle of the night may not indicate an inability to sleep, but rather an attempt by the brain to sleep
aturally.\
question
which of the following pieces of information, if added to the last paragraph (sentences 12-15), would best support the writers argument?
○ although common elsewhere, napping during the workday is not generally accepted in the united states.
○ other research suggests that insomnia may be hereditary.
○ the industrial revolution and the invention of the light bulb also contributed to the demise of segmented sleep.
○ the afternoon slump that many workers experience is partly a result of the digestion of their lunches.

Explanation:

The writer's argument in the last paragraph is about the change in sleep patterns (from segmented sleep to consolidated sleep) due to factors like street lighting and the resulting modern sleep disorders. The option about the industrial revolution and the light - bulb invention adds another factor (similar to street lighting in the 1700s) that contributed to the demise of segmented sleep, thus supporting the argument. The other options are either about napping (not related to the main sleep pattern change argument), heredity (not relevant to the environmental - factor - based argument in the paragraph), or afternoon slump (digestion - related, not relevant to sleep pattern change).

Answer:

The industrial revolution and the invention of the light bulb also contributed to the demise of segmented sleep.