The stated hypothesis is that the herb is able to grow because it produces H that renders the metals inactive. Anything that supports that the the plant actually renders the metals inactive will strengthen the hypothesis.
Only D states that after a period of time the same soil becomes suitable for growth for other plants which were not able to grow previously due to the metals in the soil. This fact proves that the extended period of growth of that herb must have made the metals in the soil inactive
...
Only D states that after a period of time the same soil becomes suitable for growth for other plants which were not able to grow previously due to the metals in the soil. This fact proves that the extended period of growth of that herb must have made the metals in the soil inactive
...
![FLO – Therapy at the Club – Pre-Single [iTunes Plus M4A]](http://is1-ssl.mzstatic.com/image/thumb/Music221/v4/a4/11/88/a41188ed-0f2e-e8d5-1163-d59e373cc58c/26UMGIM30046.rgb.jpg/208x208bb.webp)
