Certain bacteria that produce hydrogen sulfide as a waste product would die if directly exposed to oxygen. The hydrogen sulfide reacts with oxygen, removing it and so preventing it from harming the bacteria. Furthermore, the hydrogen sulfide tends to kill other organisms in the area, thereby providing the bacteria with a source of food. As a result, a dense colony of these bacteria produces for itself an environment in which it can continue to thrive indefinitely.

Which one of the following is most strongly supported by the information above?

(A) A dense colony of the bacteria can indefinitely continue to produce enough hydrogen sulfide to kill other organisms in the area and to prevent oxygen from harming the bacteria

(B) The hydrogen sulfide produced by the bacteria kills other organisms in the area by reacting with and removing oxygen

(C) Most organisms, if killed by the hydrogen sulfide produced by the bacteria, can provide a source for the bacteria

(D) The bacteria can continue to thrive indefinitely only in an environment in which the hydrogen sulfide they produce has removed all oxygen and killed other organisms in the area

(E) If any colony of bacteria produces hydrogen sulfide as a waste product, it thereby ensures that it is both provided with a source of food and protected from harm by oxygen
_________________

D-Day: November 18th, 2017

Need a laugh and a break? Go here: https://gmatclub.com/forum/mental-break-funny-videos-270269.html

Need a CR tutor? PM me!

This is an Inference question. Any statement that can be concluded based on the information in the question stem/passage is the right answer choice.
A) The passage mentions that a dense colony of bacteria produces a supportive environment for itself . the environment in which it thrives indefinitely. The process the bacteria uses to do so is by producing Hydrogen Sulfide that kills other organisms in the area. Correct
B) The Hydrogen Sulfide tends to kill other organisms.But the mechanism by which it kills is not specified. Incorrect.
C) This ans choice uses different phrases from the passage and forms a conditional statement, validity of which is not supported completely by the passage. Incorrect
D) The passage mentions that hydrogen sulfide removes oxygen, but whether it removes ALL oxygen or not is not supported by the passage. Incorrect
E) Passage mention about "Certain Bacteria" but the ans choice generalizes this for "Any colony of Bacteria" .Hence Incorrect.