다음 문제에 대한 설명 좀 부탁드릴께요. PT 79, Section 4. 19번
*Archaeologist: Neanderthals, a human-like species living 60,000 years ago, probably preserved meat by smoking it.
Burnt lichen and grass have been found in many Neanderthal fireplaces. A fire of lichen and grass produces a lot of smoke but does not produce nearly as much heat or light as a wood fire*
-Which one of the following, if true, would most weaken the archaeologist's argument?
a. In close proximity to the fireplaces with lichen and grass are other fireplaces that, evidence suggest, burned material that produced more heat than smoke.
b. In the region containing the Neanderthal fireplace in which lichen and grass were burnt, no plants that could be burned more effectively to produce heat or light were available 60,000 years ago.
왜 답이 b번인가요? 저는 a번 이라고 했는데...왜 a는 답이 아닌가요?
아시는 분 설명 부탁드릴께요..
감사합니다.