Answer:
I vote for 'c'..good luck
The answer would be sound waves.
Hope this helps!
The answer is Neruda, Pablo. "We Are Many." <em>We Are Many</em>, translated by Alastair Reid, Cape Goliard Press Ltd., pp. 12-13. Trust me I took the test.
Los brahmanes (castas)<span> forman la primera de las grandes castas hereditarias de la India.</span>