|Question 10Verbal

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Many believe that lullabies, characterized by their less steady beat, contain some acoustic features that are universally calming to infants. In a study, Constance M. Bainbridge and colleagues played both a lullaby sung in the Western Nahuatl language and a non-lullaby sung in the Serbian language to a group of infants. The researchers also measured the infants' heart rates, as a reduced heart rate is considered a measure of relaxation. They claim that the lullaby did indeed relax the infants.
Which finding, if true, would most directly support Bainbridge and colleagues claim?
The heart rates of infants in the study were more irregular during the lullabies than during non-lullabies.
A
Parents of infants in the study chose the lullaby over the non-lullaby when asked which song they Infants’ use to calm their child.
B
Infants’ heart rates were substantially lower during the lullaby than during the non-lullaby.
C
Both the song in Western Nahuatl and the song in Serbian were sung by a female singer.
D