The greatest safety risk for passengers traveling on commercial passenger airplanes is that of a midair collision. Commercial passenger airplanes can be equipped with a collision-avoidance radar system that provide with information about the proximity of other airplanes. Because the system warns pilots to take evasive action when it indicates a possible collision, passengers are safer on airplanes equipped with the system than on comparable airplanes not so equipped, even though the system frequently warms pilots to evade phantom airplanes.
10. Which one of the following is an assumption on which the argument depends?
(A) Passengers feel no safer on airplanes equipped with the radar system than on comparable airplanes not so equipped.
(B) Warnings given by a collision-avoidance system about phantom airplanes are not caused by distorted radar signals.
(C) The frequency of invalid warnings will not cause pilots routinely to disregard the system's warnings.
(D) Commercial passenger airplanes are not the only planes that can be equipped with collision-avoidance system.

why A is wrong .

OA to come

one more

The higher the average fat intake among the residents of a country, the higher the incidence of cancer in that country; the lower the average fat intake, the lower the incidence of cancer. So individuals who want to reduce their risk of cancer should reduce their fat intake.
Which one of the following, if true, most weaken the argument?
(A) The differences in average fat intake between countries are often due to the varying makeup of traditional diets.
(B) The countries with a high average fat intake tend to be among the wealthiest in the world.
(C) Cancer is a prominent cause of death in countries with a low average fat intake.
(D) The countries with high average fat intake are also the countries with highest levels of environmental pollution.
(E) An individual resident of a country whose population has a high average fat intake may have a diet with a low fat intake.

why no C

OA to come