Question

According to research done by environmental scientists, releases of huge quantities of greenhouse gases such as carbon dioxide is causing ozone depletion in the upper atmosphere. Due to ozone depletion, harmful rays will be able to enter the earth’s environment and this could cause serious immunodeficiency disorders in most mammals. Which of the following statements has been assumed to support the above argument?

• A. Due to global warming from ozone depletion, the temperature of the earth is rising which is causing immunity disorders in some mammals.
• B. Due to ozone depletion, some harmful rays are able to enter the earth’s environment.
• C. All rays entering the earth’s environment are not harmful for mammals.
• D. Humans are not affected by harmful rays entering the earth’s environment.

Answer 1

The correct option is B Due to ozone depletion, some harmful rays are able to enter the earth’s environment.

The conclusion: Due to ozone depletion, harmful rays will be able to enter the earth’s environment and this could cause serious immunodeficiency disorders in most mammals.
One possible assumption is that due to ozone depletion harmful rays are able to enter the earth’s environment. Option B states this and is the correct answer.
Option A ascribes immunodeficiency disorders in mammals to global warming and not harmful rays (as stated in the argument). Eliminate option A.
Option C does not connect the premise with the conclusion in any way. All rays may not be harmful but some may be.
Option D too is not the correct assumption. The argument mentions most mammals would be affected. It is possible that humans will not be part of the affected group.
Hence, the correct answer is option B