koyikoyi

The problem with E is the following:
Based on the fact stated in the stimulus, histidine, an amino acid that, in test-tube solutions, renders these metals chemically inert. The conclusion of the argument is: the herb’s high histidine production is what allows it to grow in metal-rich soils.

If E is right, then when the herb matures, it will not produce large enough amount of histidine to protect the herb from the metals in the environment. If that is true and the herb lives in a metal-rich places, it casts doubts on the hypothesis that the production of histidine is necessary for the herb to survive.

So E is out.

C is the right answer.

koyikoyi

Guys, this is a sufficient assumption question. All you need to do is to plug in each answer choice and see if you can complete the conclusion in the stimulus.

Try it.

koyikoyi

Guys, this is a sufficient assumption question. All you need to do is to plug in each answer choice and see if you can complete the conclusion in the stimulus.

Try it.