GMAT Verbal Reasoning Practice Test 8

HOTSPOT
Chemicals 1-5
The Workplace Safety Agency (WSA) in Nation X uses three levels to classify the hazard level posed by chemical reactions: Levels A, B, and C, where Level A reactions are most hazardous, and Level C reactions are least hazardous.
The diagram shows the hazard level assigned by the WSA to reactions among 5 chemicals (Chemicals 1 through 5). A straight line in the diagram connects two chemicals if the two chemicals react, and the label on the line indicates the hazard level of the reaction. Chemicals not connected by a line in the diagram do not react.
Chemicals 6 and 7
Two chemicals, Chemicals 6 and 7, have recently been identified as having important uses, and the WSA has begun identifying and classifying reactions between Chemicals 6 and 7 and the other chemicals. Chemicals 6 and 7 do not react with one another. The table shows the WSA’s classification of reactions between Chemicals 6 and 7 and Chemicals 1 through 5. If no classification is given, the two chemicals do not react.