Premise: Some plant species have adapted to survive and even thrive in fires.
Conclusion: Forest fires are a natural part of the ecosystem in certain types of forest environments.
Which of the following statements, if true, most
strengthens the argument above?
(A) Recent campaigns to eliminate forest fires have saved thousands of plants from burning.This answer choice is not connected to argument. We are not talking about how plants are saved or not saved. We are talking about whether are a natural part of the ecosystem
(B) Many forest plants have seeds that do not germinate unless exposed to intense heat and smoke.This answer choice strengthens the argument. It is common knowledge that fire causes heat and smoke. What this answer choice says is that some seeds don't germinate without heat and smoke, and what causes heat and smoke: Fire. It may that some other factor may cause heat and smoke but the GMAT won't expect us to bring that kind of outside knowledge.
(C) One technique used to limit the spread of forest fires is to burn the area surrounding the fire to the ground.This answer choice is incorrect for the same reason as (A)
(D) Despite intense human intervention and innovation, huge forest fires break out every year in the United States.This answer choice is incorrect for the same reason as (A)
(E) Some plant species release many potentially toxic chemicals into the atmosphere when burnt.This answer choice does not strengthen the argument. In any case, it may weaken the argument. It may be the case that the toxic chemicals released into the atmosphere hurt the growth of other plants