I think the correct answer is A
It would be helpful because she would need different air to balance her heart weight?
Found this online hope it helps!
Encontró esta esperanza en línea que ayuda!
http://www.un.org/esa/socdev/unyin/documents/ch04.pdf
I did not write this, please dont give me credit for document.
<span>No escribí esto, por favor, no me dan crédito por el documento.</span>
The answer is B ( too many words can cause confusion)
Good luck on your test