Read the statement or passage and then choose the best answer to the question. Answer the question on the basis of what is stated or implied in the statement or passage. A recent study conducted by British zoologists concludes that, like birds and other animals, human beings posses a "homing instinct." The study showed this homing instinct or natural sense of direction is based on some king of perception of magnetic fields. When blindfolded students who otherwise displayed a keen homing sense were made to wear helmets containing magnets, they became disoriented. The passage suggests that the cause of the students' disorientation was that the magnets in the helmets interfered with their homing sense blindfolds prevented them from seeing their surroundings effectiveness of the homing sense declines over time helmet, by covering their ears, interfered with their hearing