Some scientists believe that in certain species of birds actual particles of metal within the brain ...........

Logical Reasoning(Insurance) Statement - Conclusions

Some scientists believe that, in certain species of birds, actual particles of metal within the brain react to the Earth’s magnetic field in the same way as the needle in a compass. It is this mechanism that is thought to underlie the birds’ amazing ability to navigate accurately over distances of thousands of miles by day and night during migration. To test this theory, researchers surgically removed the metal particles from the heads of some birds and then released them, along with a number of untreated birds, at the usual time and place of their annual winter migration.

Which of the following results would most seriously weaken the theory being tested?

The untreated birds were confused by the erratic flight patterns of the surgically treated birds and failed to migrate successfully.

The surgically treated birds were able to follow their usual flight patterns successfully by day, but not by night.

The surgically treated birds were able to migrate about as accurately as the untreated birds.

The surgically treated birds were able to migrate successfully only when closely following a group of untreated birds.

In addition to being impaired in their migration ability, the surgically treated birds suffered a variety of other disabling effects.

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Explanation:

The question stem here asks for the evidence that would most weaken the theory that the metal particles are important to the bird’s navigational mechanism. The best refutation of the theory would be a finding that when the particles are removed, the birds continue to migrate as effectively as before. (c) is tantamount to saying that this was the case