The correct option to fill the blank is:
- El corazón de las personas está en el pecho.
Reasoning of the sentence.
The sentence is Spanish refers to the biology of the human body, where it asks about the location of an important organ for the transport of blood through the circulatory system.
The sentence mentions that the location of a person's heart is in the chest, an option that in Spanish translates as "el pecho," therefore, that option is the correct one.
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