Which statement is true for particles of the medium of an earthquake P-wave? A.THEY VIBRATE IN A DIRECTION PARALLEL TO THAT OF THE WAVE, FORMING CRESTS AND TROUGHS. B. THEY VIBRATE IN A DIRECTION PARALLEL TO THAT OF THE WAVE, FORMING COMPRESIONS AND RAREFACTIONS. C. THEY VIBRATE IN A DIRECTION PERPENDICULAR TO THAT OF THE WAVE, FORMING CRESTS AND TROUGHS D. THEY VIBRATE IN A DIRECTION PERPENDICULAR TO THAT OF THE WAVE, FORMING COMPRESSIONS AND RAREFACTIONS