Question ID:PT80 S4 Q7 Passage:Although some animals exhibit a mild skin reaction to urushiol, an oil produced by plants such as poison oak and poison ivy, it appears that only humans develop painful rashes from touching it. In fact, wood rats even use branches from the poison oak plant to build their nests. Therefore, urushiol probably did not evolve in these plants as a chemical defense. Stem:Which one of the following, if true, adds the most support for the conclusion of the argument? Correct Answer Choice:BChoice A:Wood rats build their nests using dead, brittle branches, not live ones. Choice B:A number of different animals use poison oak and poison ivy as food sources. Choice C:It is common for plants to defend themselves by producing chemical substances. Choice D:In approximately 85 percent of the human population, very small amounts of urushiol can cause a rash. Choice E:Poison oak and poison ivy grow particularly well in places where humans have altered natural forest ecosystems.