At low soil pH levels (5 or less), what can happen?

• A. Cation exchange will be enhanced, causing the plants to grow faster.
• B. Plant roots are eaten away by the acidic soil.
• C. Absorption of negatively charged ions is enhanced, causing the plants to grow faster.
• D. Absorption of calcium is enhanced, but iron is unavailable.
• E. Toxic aluminum ions become more available, stunting the plant's growth.