Researchers studying magnetosensation have determined why some soil-dwelling roundworms in the Southern Hemisphere move in the opposite direction of Earth's magnetic field when searching for_
_ in the Northern Hemisphere, the
magnetic field points down, into the ground, but in the Southern Hemisphere, it points up, toward the surface and away from worms' food sources.
Which choice completes the text so that it conforms to the conventions of Standard English?
A) food:
B) food,
C) food while
D) food