Don’t lose your progress!

We cover every section of the GMAT with in-depth lessons, 5000+ practice questions and realistic practice tests.

Up to 90+ points GMAT score improvement guarantee

The best guarantee you’ll find

Our Premium and Ultimate plans guarantee up to 90+ points score increase or your money back.

Master each section of the test

Comprehensive GMAT prep

We cover every section of the GMAT with in-depth lessons, 5000+ practice questions and realistic practice tests.

Schedule-free studying

Learn on the go

Study whenever and wherever you want with our iOS and Android mobile apps.

The most effective way to study

Personalized GMAT prep, just for you!

Adaptive learning technology focuses on your academic weaknesses.

Critical Reasoning: Conclusion Weakening Questions

Which of the following, if true, would most weaken the author's theory that the bad state of the Grauballe man's teeth suggested that he had not lived exclusively on the type of vegetable diet that his last meal represented?

Incorrect.

[[snippet]]

This answer choice supports, not weakens, the author's theory. If eating meat makes teeth deteriorate, then it strengthens the author's conclusion that a diet not based on vegetables caused the poor state of the Grauballe mans' teeth.

Incorrect.

[[snippet]]

While this answer choice may be seen as reducing the chances that the author's theory is correct, thereby weakening it, notice that the author draws a conclusion about the Grauballe man alone, who may or may not have had a vegetarian diet, regardless of the times.

At any rate, there is an answer choice which more significantly weakens the author's conclusion. Look for it!

Incorrect.

[[snippet]]

This answer choice strengthens rather than weakens the author's theory, by ruling out an alternative explanation - that the Grauballe man's last meal had something to do with the state of his teeth.

Incorrect.

[[snippet]]

This answer choice neither weakens nor strengthens the author's theory. Even if the Grauballe man's diet was detrimental to his teeth, it still may have been beneficial for his bones.

Good!

[[snippet]]

This answer choice attacks the assumption that the man's teeth were in a bad state because of the food he usually ate by giving an alternative explanation for their bad condition.

Conditions in the bog deteriorated the teeth after the man died.
Eating meat makes teeth deteriorate.
Findings elsewhere reveal that Iron Age people were usually vegetarians.
The composition of the Grauballe man's bones indicates that he had a well balanced diet.
The ingredients of the Grauballe man's last meal did not have any effect on the state of his teeth.